McGraw-Hill, 1981
Buku Teks
Helen L. Van Hoozer [and others]
Appleton Century Crofts, 1987
Buku Teks
Kelly, L.G.
Basil Blackwell, 1979
Buku Teks
Zahra Fani Robyanti, author
Fakultas Ilmu Administrasi Universitas Indonesia, 2024
UI - Skripsi Membership
Ur, Penny, author
Cambridge University Press, 2006
Buku Teks