This is a very detailed explanation of human vs animal language where you can read different other new ideas about animal and human language.
You can download this book for free (attached here) if you would like to expand your reading list on Linguistics.
The six major language families and their language counts as per 2019 report
An explanatory video about prescriptive vs descriptive Linguistics
A useful paper that explains further studies on Language and Speech dichotomy
To access the Phonetics course, please click the link below.