Artikel Jurnal
Davis, Gordon B., author
PPM, 2002
Buku Teks
Davis, Gordon B., author
Pustaka Binaman Pressindo, 1987
Buku Teks
Davis, Gordon B., author
Pustaka Binaman Pressindo, 1985
Buku Teks
Davis, Gordon B., author
Pustaka Binaman Pressindo, 1985
Buku Teks