Carlson, Ronald L., author
Anderson, 1970
Buku Teks
Gammage, Allen Z., author
McGraw-Hill, 1974
Buku Teks
Yingyi, Situ, author
Sage Publications, 2000
Buku Teks
Pound, Roscoe, author
University of Pitsburgh Press, 1942
Buku Teks
Nemeth, Charles P., author
Jones and Bartlett, 2011
Buku Teks