Kelly, Robert L.,author
Wadsworth, 2010
Buku Teks
SPAFA, 1984
Buku Referensi
edited by Mari Pritchard Parker, Elvio Angeloni
McGraw-Hill, 2013
Buku Teks
Yearn, Hong-choi, author
Shinkwang Publishing, 2008
Buku Teks
Kegan Paul International , 1999
Buku Referensi