Blij, Harm J.. de
John Wiley & Sons, 1994
Buku Teks SO
Haggett, Peter
Prentice-Hall, 2001
Buku Teks
R. Bintarto
LP3ES, 1991
Buku Teks SO
by Christopher L. Salter ... [et al.]
Saunders College, 2000
Buku Teks SO
Blij, Harm J.. de
John Wiley & Sons, 1997
Buku Teks SO