APA

Blough G. O., . (1951). Elementary-school science and how to teach it. New York: Dryden Press.

Chicago

Blough Glenn Orlando, . 1951. Elementary-school science and how to teach it. New York: Dryden Press.

Harvard

Blough G. O., . (1951). Elementary-school science and how to teach it. New York: Dryden Press.

MLA

Blough Glenn Orlando, . Elementary-school science and how to teach it. New York: Dryden Press. 1951.