Erita Narhetali, author
Fakultas Psikologi Universitas Indonesia dan Ikatan Psikologi Sosial-HIMPSI, 2017
Artikel Jurnal
edited by Anne Roe and George Gaylord Simpson
Yale University Press, 1961
Buku Teks
Combs, Arthur W., author
Harper & Row, Publishers., 1959
Buku Teks
Powell, Russell A., 1950-, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Powell, Russell A., 1950-, author
Cengage Learning, 2017
Buku Teks