edited by Murray Moo-Young, Charles L. Cooney and Arthur E. Humphrey
Pergamon Press, 1985
Buku Teks
Sobti, R.C.
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Barnum, Susan R.
Wadsworth, 1998
Buku Teks
Wiley-VCH, 2004
Buku Teks
edited by Martin Fransman, Gerd Junne and Annemieke Roobeek
Blackwell, 1995
Buku Teks