Hutchings, F.G.B., author
Oxford University Press, 1969
Buku Teks
Viswanathan, C.G.
Print House, 1985
Buku Referensi
Patrick, Gay D., author
Neal-Schuman, 1992
Buku Referensi
Curtis, Donnelyn, author
Facet, 2005
Buku Teks
Stein, Barbara L., author
Neal-Schuman, 1992
Buku Referensi