Foster, George M., author
Brown and Comp, 1969
Buku Teks
Foster, George M., author
John Wiley & Sons, 1978
Buku Teks
Cochrane, Glynn, author
Oxford University Press, 1971
Buku Teks
Nanda, Serena, author
Wadsworth, 2002
Buku Teks
Doyglas J. Davies, author
Berg, 2002
Buku Teks