editor, Gunadi
Multi Utama Publishing, 2002
Buku Teks
Frank, Marcella, author
Prentice-Hall, 1972
Buku Teks
Block, Mervin, author
Sage, 2012
Buku Teks
Beaty, Wayne H., editor
McGraw-Hill Publishing Company, 1990
Buku Referensi
edited by A.J. Walford
Library Association, 1981
Buku Referensi