Zipf, G. K. (1941). National unity and disunity: The nation as a bio-social organism. Bloomington: Principia Press. [FULLTEXT]
A History of Psycholinguistics
Bibliography for Levelt (2013)

Zipf, G. K. (1941). National unity and disunity: The nation as a bio-social organism. Bloomington: Principia Press. [FULLTEXT]