Delbecq, Andre L., author
Green Briar Press, 1986
Buku Teks
Delbecq, Andre L., author
Scott, Foresman, 1975
Buku Teks
Fachmi Basyaib, author
Grassindo (Gramedia Widiasarana Indonesia), 2006
Buku Teks
Brooks/Cole Publishing , 1982
Buku Teks
Gulley, Halbert E., author
Holt, Rinehart and Winston, 1977
Buku Teks