Clarke, David L, author
Methuen, 1968
Buku Teks
Kelly, Robert L.,author
Wadsworth, 2010
Buku Teks
edited by Mari Pritchard Parker, Elvio Angeloni
McGraw-Hill, 2013
Buku Teks
SPAFA, 1984
Buku Referensi
edited by Susan E. Alcock, Robin Osborne
Blackwell, 2007
Buku Teks