Aggleton, Peter
London : Churchill Livingstone Inc., 1994,
Buku Referensi
Artikel Jurnal
Fan, Hung
Jones And Bartlett Publishers, 2003
Buku Teks
Harahap, Syaiful W
Pustaka Sinar Harapan, 2000
Buku Teks SO
Wartburg, Walther von
Ciba-geigy, Roche und Sandoz, 1989
Buku Teks SO