Marion, J. Peter
Bureau of Science and Technology United States Agency for International Development , 1987
Buku Teks
Johnson, Hazel J., author
McGraw-Hill, 1993
Buku Teks
Polakoff, Murray Emanuel, 1922-, author
Houghton Miffiln, 1970
Buku Teks
edited by Donald R. Fraser and Peter S. Rose
Business Publications, 1980
Buku Teks
Rose, Peter S., author
McGraw-Hill, 2005
Buku Teks