Masefield, John
Heinemann, 1917
Buku Teks
Ford, Roger
London: Grange Books, 1997,
Buku Referensi
Fitchen, John
MIT Press, 1996
Buku Teks
Fadliah Mirnawati
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2007
UI - Tesis Membership
Merriam, Robert E. (Robert Edward), 1918-
Harper & Brothers, 1957
Buku Teks