Terry, George Robert, author
Learning Systems, 1981
Buku Teks
Allen, Louis A., author
McGraw-Hill, 1958
Buku Teks
edited Max D. Richards and William A. Nielander
South-Western Publishing, 1958
Buku Teks
Cerami, Charles A., author
Prentice-Hall, 1957
Buku Teks
Hodges, Henry G., author
Houghton Miffiln, 1955
Buku Teks