Penniman, Clara
John Hopkins University Press, 1980
Buku Teks
Gaffney, Dennis J., author
McGraw-Hill, 1982
Buku Teks
Gaffney, Dennis J., author
McGraw-Hill, 1984
Buku Teks
Hudson, David M., author
St. Paul, Minn, 1994
Buku Teks
Kahn, Douglas A., 1934-, author
Thomson/West, 1994
Buku Teks