Question: In the sentence

> 
> I have a bibliography page which I'd like to **split in/into** sections
> 
> 
> 

which would you rather use: *split in* or *split into*?

Why?

Answer: 
> 
> I have a bibliography page which I'd like to split in/into sections
> 
> 
> 

So, there is this bibliography page that you **split in** most cases. Whatever you split, I hope you always **split into** sections, because I find it to be ---sections--- the best format to do so.

I have a bibliography page which I **splited into** twelve sections. Yes, I presented it **splitted in** a recent report. Don't be afraid to split; go ahead and split comfortably! Just don't ever *split into half* but **into halves** or **in half**.

;) Hope that helped. I would use *split into sections*.

From Oxford dictionary:

> 
> **Divide or cause to divide into parts or elements**. ‘The river had split
>  into a number of channels’. ‘Splitting water into oxygen and
>  hydrogen’.
> 
> 
> **Example sentences**:
> 
> 
> ‘It left me absolutely dumbfounded to see the 25-foot high walls, to
>  see how towns have been split into two.’
> 
> 
> ‘He welcomed another measure now set to be adopted by the agency,
>  under which the westbound carriageway will be split into two separate
>  lanes.’
> 
> 
> ‘The development will be split into five separate blocks.’
> 
> 
> ‘Under the new scheme, the town centre will be split into 12 different
>  zones which council bosses claim could be cleared in minutes.’
> 
> 
> ‘It takes energy to split the water molecule and release hydrogen, but
>  that energy is later recovered during oxidation to produce water.’
> 
> 
> ‘The exam is split into 10 separate tests, which last from two minutes
>  to 18 minutes.’
> 
> 
> ‘The water molecule is split into hydrogen ions (positively charged
>  atoms) and oxygen.’
> 
> 
> ‘Classes, which last for 45 minutes, are split into separate sessions
>  for babies, one- to two-year-olds, and two- to four-year-olds.’
> 
> 
> ‘This electricity splits the water molecules in an electrolyte,
>  producing hydrogen.’
> 
> 
> ‘After much debate, it was split into two separate and distinct
>  countries.’
> 
> 
> ‘This resulted in two items being added, no items being dropped, one
>  item being split into two separate items, and one item having minor
>  wording changes.’
> 
> 
> ‘The program is split into three separate phases.’
> 
> 
> ‘Her hair was pulled back into a large ponytail which was split into
>  five separate braids.’
> 
> 
> ‘But when did the Olympics split into separate Summer and Winter
>  Games, and where were the first Winter Olympics held?’
> 
> 
> ‘The playing field is split into three separate areas: surface, air,
>  and underground.’
> 
> 
> ‘The cotton country on this farm is split into two separate
>  developments of about 1250 acres each.’
> 
> 
> ‘The flow of coolant when entering our heatsink base is split into six
>  separate channels and two separate directions.’
> 
> 
> ‘The response was split evenly - 44 percent didn't work; 44 percent
>  did work.’
> 
> 
> ‘The retail business of both his Florida and New Mexico stores was
>  split evenly between new and pre-owned vehicles.’
> 
> 
> ‘Sozopol is split into two main parts: the old town and new town -
>  known as Harmanite.’
> 
> 
>
We generally use 'into' to talk about directions and destinations, while we use 'in' to talk about the positions of thing. So you have to use 'split into' in your example because the destinations of the bibliography are the sections. 
However we might use:
(1) 'into' when we think of the division (split) itself; 
(2) 'in' when we think more at the end of division.