De Blij, Harm J., author
John Wiley & Sons, 1994
Buku Teks
VanCleave, Janice Pratt
Pustaka Utama Grafiti, 1993
Buku Teks
R. Bintarto, author
LP3ES, 1991
Buku Teks
Saunders College Publishing, 2000
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 1997
Buku Teks