Every, Dale Van
A Mentor Book, 1963
Buku Teks
Tucker, Glenn
The Bobbs-Merrill Co., 1956
Buku Teks
Buley, R. Carlyle, author
Indiana University Press, 1962
Buku Teks
Berton, Pierre, author
McClelland and Stewart, 1978
Buku Teks
Garst, Shannon, author
Sinar Agape Press, 1966
Buku Teks