Meyers, Robert A., editor
John Wiley & Sons, 1983
Buku Referensi
Chugh, Chandra Parkash, author
Oxford & IBH Publishing Co., 1977
Buku Referensi
editor in chief, Gerard H. "Gus" Gaynor
McGraw-Hill, 1996
Buku Referensi
Shah, Vishu, author
John Wiley & Sons, 1998
Buku Referensi
Kemper, Alfred M., author
Wiley, 1979
Buku Referensi