APA (7th ed.) Citation

HARTMAN, H. M. (1960). Learn biology: The easy way. Greystone Press.

Chicago Style (17th ed.) Citation

HARTMAN, Harold M. Learn Biology: The Easy Way. Cambridge: Greystone Press, 1960.

MLA (9th ed.) Citation

HARTMAN, Harold M. Learn Biology: The Easy Way. Greystone Press, 1960.

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