Miles, Matthew B.
Teachers College Press, 1973
Buku Teks
Konopka, Gisela
Prentice-Hall, 1963
Buku Teks
Trecker, Harleigh B.
Association Press, 1967
Buku Teks
Alfi Sanubari
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2019
UI - Skripsi (Membership)
McDavid, John W.
Harper & Row Publishers, 1968
Buku Teks