Bent, Ralph D.
McGraw-Hill, 1981
Buku Teks
Raymond, Jack, 1918-2007
Harper & Row Publishers, 1964
Buku Teks
Mawdsley, Ralph D
NOLPE, 1984
Buku Teks
[publisher not identified], [date of publication not identified]
Naskah
Mezirow, Jack D.
Scarecrow Press , 1963
Buku Teks