Syarifuddin, author
Phoenix Publisher, 2019
Buku Teks
Shetter, William Z., author
Martinus Nijhoff, 1988
Buku Teks
Hudson, Richard
Basic Blackwell , 1984
Buku Teks
Ross, Claudia, author
Cambridge University Press, 2005
Buku Teks
Lennie, Delia.
Longmans, 1960
Buku Teks