Francis, Robert A., author
Routledge, 2013
Buku Teks
Zastrow, Charles, author
Cengage Learning, 2016
Buku Teks
edited by Gwen Bell
Hawaii University Press, 1976
Buku Teks
Baddeley, Alan, author
Lawrence Erlbaum Associates, 1990
Buku Teks
Keith, Arthur, Sir, author
Watts & Co., 1950
Buku Teks