Sizer, John
Penguin books, 1989
Buku Teks
Hansen, Don R., author
Erlangga, 1999
Buku Teks
Mcnamee, Patrick
Heinemann , 1988
Buku Teks
edited by Marc J. Epstein, Mary A. Malina
Emerald, 2017
eBooks
Nelson, A. Tom
California Goodyear Pub., 1981
Buku Teks