Niebuhr, Reinhold, author
Charles Scribners Sons, 1945
Buku Teks
Parse, Rosemarie Rizzo, author
John Wiley & Sons, 1981
Buku Teks
Royce, James E.
McGraw-Hill, 1961
Buku Teks
Makarenko, A.S., author
Progress Publishers, 1965
Buku Teks
Rachels, James, 1941-2003, author
McGraw-Hill, 2012
Buku Teks