edited by Paul L. Kleinsorge
University of Oregan Books, 1966
Buku Teks
Tresch, Richard W.
Business Publications ; Georgetown, Ont. : Irwin-Dorsey, 1981.
Buku Teks
Academic Press, 2015
eBooks
Lutz, Harley Leist
D. Appleton-Century, 1947
Buku Teks
Eckstein, Otto
Prentice-Hall, 1967
Buku Teks