Warren, H. C. (1930). Elements of human psychology (Rev. and enl. ed.). Houghton Mifflin Co.
Cita Chicago (17th ed.)Warren, Howard Crosby. Elements of Human Psychology. Rev. and enl. ed. Boston: Houghton Mifflin Co, 1930.
Cita MLA (9th ed.)Warren, Howard Crosby. Elements of Human Psychology. Rev. and enl. ed. Houghton Mifflin Co, 1930.
Atenció: Aquestes cites poden no estar 100% correctes.