APA (7th ed.) Citation

Langfeld, H. S., & Allport, F. H. (1920). An elementary laboratory course in psychology (2., rev. ed.). Houghton Mifflin [u.a.].

Chicago Style (17th ed.) Citation

Langfeld, Herbert Sidney, and Floyd Henry Allport. An Elementary Laboratory Course in Psychology. 2., rev. ed. Boston [u.a.]: Houghton Mifflin [u.a.], 1920.

MLA (9th ed.) Citation

Langfeld, Herbert Sidney, and Floyd Henry Allport. An Elementary Laboratory Course in Psychology. 2., rev. ed. Houghton Mifflin [u.a.], 1920.