What are the canonical definitions of vitarka-vicara in the Tripitaka or related literature The quote below defines Vitarka-vicara as:


Ardency (atappa) + mindfulness (sati) => combines to make vitakka
Ardency (atappa) + alertness (sampajañña) => combines to make vicara



  As Ajaan Lee, my teacher’s teacher, once noted, mindfulness combined with ardency turns into the concentration factor called vitakka, or directed thought, where you keep your thoughts consistently focused on one object, such as the breath. Alertness combined with ardency turns into another concentration factor: vicāra, or evaluation


Head &amp; Heart Together, by Ṭhānissaro Bhikkhu, Chapter: Mindfulness Defined

No citation from the cannon have been given in this discussion.

What are the Tipitaka, commentary, sub commentary sources, including primary, secondary or tertiary source with citations, which defines Vitarka-vicara as such?

Are there other definitions of Vitarka-vicara from Tipitaka, commentaries, sub commentaries, including primary, secondary or tertiary source with citations?
From Khuddaka Nikaya's The Questions of King Milinda (translation mine):


  ‘Venerable Nagasena, what is the characteristic mark of vitakka*?’ 
  
  ‘The characteristic mark of vitakka is "placing" (Appanā), Your Majesty.’  
  
  ‘Give me an example.’  
  
  ‘For example, Your Majesty, like a carpenter takes well-finished boards of wood and places (appeti) them in position.’    
  
  Mil 3.3.13


*ideation, reasoning, putting forward ideas, postulating a premise




  ‘Venerable Nagasena, what is the characteristic mark of vicāra*?’
  
  ‘The characteristic mark of vicāra is pondering/mulling over (anumajjana), Your Majesty.’
  
  ‘Give me an example.’
  
  ‘For example, Your Majesty, if you strike on a copper vessel, it then rings for a while, it responds with a sound. Here, Your Majesty, the strike is a simile for vitakka and the reverberation is a simile for vicāra.’
  
  Mil 3.3.14


*investigating a premise, considering an idea to weigh its implications