Grammar (English Wikipedia)

O'Grady, William; Dobrovolsky, Michael; Katamba, Francis (1996). Contemporary Linguistics: An Introduction. Harlow, Essex: Longman. pp. 4–7, 464–539. ISBN 978-0-582-24691-1.
Holmes, Janet (2001). An Introduction to Sociolinguistics (2nd ed.). Harlow, Essex: Longman. pp. 73–94. ISBN 978-0-582-32861-7.
Casson, Lionel (2001). Libraries in the Ancient World. New Haven, Connecticut: Yale University Press. p. 45. ISBN 978-0-300-09721-4. Archived from the original on 24 August 2021. Retrieved 11 November 2020.
Gussenhoven, Carlos; Jacobs, Haike (2005). Understanding Phonology (2nd ed.). London: Hodder Arnold. ISBN 978-0-340-80735-4. Archived from the original on 19 August 2021. Retrieved 11 November 2020.

britannica.com (Global: 40^th place; English: 58^th place)

Ashtadhyayi, Work by Panini. Encyclopædia Britannica. 2013. Archived from the original on 5 August 2017. Retrieved 23 October 2017. Ashtadhyayi, Sanskrit Aṣṭādhyāyī ("Eight Chapters"), Sanskrit treatise on grammar written in the 6th to 5th century BCE by the Indian grammarian Panini.

Carter, Ronald; McCarthy, Michael (2017). "Spoken Grammar: Where are We and Where are We Going?". Applied Linguistics. 38: 1–20. doi:10.1093/applin/amu080.
Graham, Steve; Perin, Dolores (2007). "A meta-analysis of writing instruction for adolescent students". Journal of Educational Psychology. 99 (3): 445–476. CiteSeerX 10.1.1.462.2356. doi:10.1037/0022-0663.99.3.445.
Graham, Steve; McKeown, Debra; Kiuhara, Sharlene; Harris, Karen R. (2012). "A meta-analysis of writing instruction for students in the elementary grades". Journal of Educational Psychology. 104 (4): 879–896. doi:10.1037/a0029185.
Breuer, Esther Odilia (14 July 2017). "Revision Processes in First Language and Foreign Language Writing: Differences and Similarities in the Success of Revision Processes". Journal of Academic Writing. 7 (1): 27–42. doi:10.18552/joaw.v7i1.214. ISSN 2225-8973.
Breuer, Esther Odilia (14 July 2017). "Revision Processes in First Language and Foreign Language Writing: Differences and Similarities in the Success of Revision Processes". Journal of Academic Writing. 7 (1): 27–42. doi:10.18552/joaw.v7i1.214. ISSN 2225-8973.

Harper, Douglas. "Grammar". Online Etymological Dictionary. Archived from the original on 9 March 2013. Retrieved 8 April 2010.

"National Grammar Day". Quick and Dirty Tips. Archived from the original on 12 November 2021. Retrieved 12 November 2021.

Harper, Douglas. "Grammar". Online Etymological Dictionary. Archived from the original on 9 March 2013. Retrieved 8 April 2010.
Ashtadhyayi, Work by Panini. Encyclopædia Britannica. 2013. Archived from the original on 5 August 2017. Retrieved 23 October 2017. Ashtadhyayi, Sanskrit Aṣṭādhyāyī ("Eight Chapters"), Sanskrit treatise on grammar written in the 6th to 5th century BCE by the Indian grammarian Panini.
Casson, Lionel (2001). Libraries in the Ancient World. New Haven, Connecticut: Yale University Press. p. 45. ISBN 978-0-300-09721-4. Archived from the original on 24 August 2021. Retrieved 11 November 2020.
Gussenhoven, Carlos; Jacobs, Haike (2005). Understanding Phonology (2nd ed.). London: Hodder Arnold. ISBN 978-0-340-80735-4. Archived from the original on 19 August 2021. Retrieved 11 November 2020.
"National Grammar Day". Quick and Dirty Tips. Archived from the original on 12 November 2021. Retrieved 12 November 2021.