The Port-Royal Grammar of 1660 identified similar principles; Chomsky, Noam (1972). Language and Mind. Harcourt Brace Jovanovich. ISBN978-0-15-147810-1.
Pollard, Carl; Ivan A. Sag (1994). Head-driven phrase structure grammar. Chicago: University of Chicago Press.CS1 одржавање: Вишеструка имена: списак аутора (веза).
The Editors of Encyclopaedia Britannica (2013). Ashtadhyayi, Work by Panini. Encyclopædia Britannica. Приступљено 23. 10. 2017., Quote: "Ashtadhyayi, Sanskrit Aṣṭādhyāyī (“Eight Chapters”), Sanskrit treatise on grammar written in the 6th to 5th century BCE by the Indian grammarian Panini."
„What is Systemic-Functional Linguistics?”. Information on Systemic Functional Linguistics. International Systemic Functional Linguistics Association. Приступљено 01. 07. 2011.