Mussen, Paul H., author
Harper & Row, [Date of publication not identified]
Buku Teks
Mussen, Paul H., author
Harper & Row, 1956
Buku Teks
William Damon, editor-in-chief
John Wiley & Sons, 1998
Buku Referensi
Artikel Jurnal
Whiting, John W. M.
Yale University Press, 1953
Buku Teks