Newman, fred, author
Routledge, 2014
Buku Teks
Derry, Jan, author
Wiley-Blackwell, 2013
Buku Teks
Veer, Rene van der, 1952-
Blackwell, 1991
Buku Teks
Yudith Masitho Relafeametha, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2005
UI - Skripsi Membership
Margenau, Henry, author
Time Incorporated, 1964
Buku Referensi