Sherif, Muzafer, author
New Haven, 1966
Buku Teks
Suroto, author
Universitas Indonesia, 2000
UI - Tesis (Membership)
Gamajanti Zulkarnaen, author
Fakultas Psikologi Universitas Indonesia, 1988
UI - Skripsi (Membership)
Tri Astuti, author
Fakultas Psikologi Universitas Indonesia, 2004
UI - Skripsi Membership
Cohen, Arthur R., author
Basic Books, 1964
Buku Teks