Genn, Robert C., author
Parker Publishing Company, 1980
Buku Referensi
Grolle, Carl G., author
Parker Publishing Company, 1977
Buku Referensi
Genn, Robert C., author
Parker Publishing Company, 1977
Buku Referensi
Genn, Robert C., author
Parker Publishing Company, 1977
Buku Referensi
Lenk, John D., author
McGraw-Hill, 1995
Buku Referensi