Ross, Murray G., author
Harper & Row , 1967
Buku Teks
Woodward, Joan, author
Oxford University Press, 1965
Buku Teks
Ott, J. Steven, author
Wadsworth and Cengage Learning, 2011
Buku Teks
Osborn, Richard N., author
John Wiley & Sons, 1980
Buku Teks
written by M. C. Barnes [and others]
Allen & Unwin, 1970
Buku Teks