Dannheisser, Lynn M.
Dian Rakyat, 2006
Buku Teks
Gilbert, Rodney
John Murray, 1926
Buku Teks
Kingdom, Elizabeth F.
Edinburgh University Press, 1991
Buku Teks
Kingdom, Elizabeth F.
Udinburgh University Press, 1991
Buku Teks
Ramo, Simon
McGraw-Hill, 1983
Buku Teks