APA (7th ed.) Citation

Sperry, W. L. (1968). Signs of these times. Books for Libraries Press.

Chicago Style (17th ed.) Citation

Sperry, Willard Learoyd. Signs of These Times. Freeport, N.Y.: Books for Libraries Press, 1968.

MLA (9th ed.) Citation

Sperry, Willard Learoyd. Signs of These Times. Books for Libraries Press, 1968.