edited by Edwin H. Gaylord, Jr., Charles N. Gaylord
McGraw-Hill, 1980
Buku Referensi
edited by, Edwin H. Gaylord
McGraw-Hill, 1990
Buku Referensi
Mosley, W.H. (William Henry), author
Macmillan, 1984
Buku Teks
Williams, Alan, author
Kaplan Education, 2005
Buku Teks
Wiley InterScience,
Majalah, Jurnal, Buletin