Jackson, Richard H., author
Wiley Eastern Limited, 1986
Buku Teks
edited by Frank Debenham
McGraw-Hill, 1960
Buku Referensi
Latz, Gil, author
John Wiley & Sons, 1996
Buku Referensi
Fuson, Robert H.
Kendall/Hunt Publishing Co., 1977
Buku Teks
Saunders College Publishing, 2000
Buku Teks