APA (7th ed.) Citation

Allen, R. L. (1966). The verb system of present-day American English. Mouton.

Chicago Style (17th ed.) Citation

Allen, Robert Livingston. The Verb System of Present-day American English. The Hague: Mouton, 1966.

MLA (9th ed.) Citation

Allen, Robert Livingston. The Verb System of Present-day American English. Mouton, 1966.

Warning: These citations may not always be 100% accurate.