Humble, John William
Pan Books, 1972
Buku Teks
Humble, John William
Erlangga, 1979
Buku Teks
Hamilton, Cheryl
Thomson/Wadsworth, 2011
Buku Teks
Kneeland, Steve
Glorier International, 2001
Buku Referensi
Morrisey, George L.
Addison-Wesley, 1977
Buku Teks