Artikel Jurnal
Shields, James J,Jr
Frederick A. Preager, 1967
Buku Teks
edited by Ralph M. Kramer, Harry Specht
Prentice-Hall, 1983
Buku Teks
Shafira Andini, author
Fakultas Psikologi Universitas Indonesia, 2020
UI - Skripsi (Membership)
Homan, Mark S., author
Cengage Learning, 2016
Buku Teks