Stead, David G., author
Angus and Robertson, 1963
Buku Teks
Burgess, Robert F., author
Dobbleday, 1970
Buku Teks
White, W.T.; Last, P.R.; Stevents, J.D.; Yearsley, G.K.; Fahmi; Dharmadi
Australian Center for International Agricultural Research, 2006
Buku Referensi
Syifa Annisa, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2021
UI - Tesis Membership
Parker, Steve
Firefly Book, 1999
Buku Referensi