References – AN 8.30: Anuruddha 
Readings by Ajahn Karuṇadhammo: [Proliferation] [Perception]
Reading: MN 18: Madhupiṇḍika Sutta, The Honeyball.
Reading: “Categorical Answers,” Skill in Questions by Ajahn Ṭhānissaro, p. 85.
Reading: AN 8.30: “Anuruddha.”
The Four Foundations of Mindfulness [2015], Session 48
Discussion of the meaning of papañca in AN 8.30 and various other suttas. [Pāli] [Translation] [Proliferation] [Perception] // [Great disciples] [Liberation] [Conditionality] [Directed thought and evaluation] [Language]
Suttas: Snp 4.11: Kalahavivāda Sutta and DN 21: Sakkapañha Sutta in which papañca precedes thinking.
Reference: Skill in Questions by Ajahn Ṭhānissaro, p. 85.
Suttas: MN 19: Dvedhāvitakka Sutta; MN 20: Vitakkasaṇṭhāna Sutta.
Reference: Concept and Reality in Early Buddhist Thought by Bhikkhu Ñāṇananda
The Four Foundations of Mindfulness [2015], Session 48, Excerpt 1