Aids for the biology teacher.

MLA

Bergren, Leslie. “Aids for the Biology Teacher.” Science Education, vol. 21, no. 5, Dec. 1937, pp. 249–50. EBSCOhost, widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edb&AN=21406647&authtype=sso&custid=ns315887.

APA

Bergren, L. (1937). Aids for the biology teacher. Science Education, 21(5), 249–250.

Chicago

Bergren, Leslie. 1937. “Aids for the Biology Teacher.” Science Education 21 (5): 249–50. http://widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edb&AN=21406647&authtype=sso&custid=ns315887.