How does the reference system of the Majjhima Nikaya work? I have come across a reference to the Majjhima Nikaya (MN) noted as MN 1.436. In my own book (The Middle Length Discourses of the Buddha: A translation of the Majjhima Nikaya by Bhikkhu Nanamoli and Bikkhu Bodhi) there are 152 suttas and each sutta can be sub-divided into a number of vaggas but I can't figure out how one arrives at the aforementioned reference (just newly started to take an interest in the literature).

Kind Regards
Bo
Ven. Bodhi's book also provides PTS references inside square brackets. For the MN 64 example, his book will show:


  "Whatever exists therein of material form, feeling, perception, formations, and consciousness, he sees those states as impermanent, as suffering, as a disease, as a tumour, as a barb, as a calamity, as an affliction, as alien, as disintegrating, as void, as not self. He turns his mind away from those states [436] and directs it towards the deathless element thus..."


Else as Andrei mentioned, simply go to suttacentral and click MN 64, then click the cogwheel icon on the upper right hand side (it'll say "Text settings" when moused over), then click the "View textual information" slider and it'll shows the infos. on the right hand side of the paragraphs.