McCormick, Charles T. (Charles Tilford), 1889-1963, author
Foundation Press, 1976
Buku Teks
Hall, Livingston, author
West Publishing, 1958
Buku Teks
Penniman, Clara
John Hopkins University Press, 1980
Buku Teks
Berry, Carole C., 1958-2014, author
Thomson Reuters, 2009
Buku Teks
Carlson, Ronald L., author
Anderson, 1970
Buku Teks