Biagi, Shirley, author
Cengage Learning, 2015
Buku Teks
Vivian, John, author
Pearson and AB, 2007
Buku Teks
edited Jyotsna Chatterji
Joint Women's Programme, 1993
Buku Teks
Oemar Seno Adji, author
Erlangga, 1973
Buku Teks
The University of Keele, 1969
Buku Teks