Lampert, Hope, author
Atheneum, 1986
Buku Teks
Rosenthal, Marilynn M., author
Open University Press, 1995
Buku Teks
Keenan, George F., author
Harper & Row, 1964
Buku Teks
Artikel Jurnal
Siti Fadilah Supari, author
Sulaksana Watinsa Indonesia (SWI), 2008
Buku Teks