APA (7th ed.) Citation

Hjelmstrom, S., & Whyte, H. (1968). Say what you mean, book 1. Longmans.

Chicago Style (17th ed.) Citation

Hjelmstrom, Svante, and Henry Whyte. Say What You Mean, Book 1. London: Longmans, 1968.

MLA (9th ed.) Citation

Hjelmstrom, Svante, and Henry Whyte. Say What You Mean, Book 1. Longmans, 1968.