APA Edition Citation

HARDIN Garrett. (1968). 39 STEPS TO BIOLOGY. W.H.FREEMAN AND COMPANY.

Chicago Edition Citation

HARDIN Garrett. 39 STEPS TO BIOLOGY. SAN FRANCISCO AND LONDON: W.H.FREEMAN AND COMPANY, 1968.

MLA Edition Citation

HARDIN Garrett. 39 STEPS TO BIOLOGY. W.H.FREEMAN AND COMPANY, 1968.