Koontz, Harold, author
McGraw-Hill , 1971
Buku Teks
Lencioni, Patrick, author
Salemba Empat, 2005
Buku Teks
Lumewa, Richard, author
Progres, 2004
Buku Teks
Stryker, Perrin, editor
Harper & Row, [date of publication not identified]
Buku Teks
Stuyck, Raymond
Brito, 1972
Buku Teks