Barish, Norman N., author
Funk & Wagnalls Company, 1951
Buku Teks
Terry, George Robert, author
Learning Systems, 1981
Buku Teks
Argenti, John, author
Allen & Unwin, 1975
Buku Teks
McFarland, Dalton E., author
Macmillan, 1974
Buku Teks
McFarland, Dalton E., author
MacMillan Co., 1959
Buku Teks