Humble, John William, author
McGraw-Hill, 1968
Buku Teks
Humble, John William, author
Pan Books, 1972
Buku Teks
Humble, John William, author
Erlangga, 1979
Buku Teks
Hamilton, Cheryl, author
Thomson/Wadsworth, 2011
Buku Teks
Kneeland, Steve, author
Glorier International, 2001
Buku Referensi