Wixon, Rufus
Alexander Hamilton Institute , 1961
Buku Teks
Jones, Reginald L., author
D.B. Taraporevala Sons, 1971
Buku Teks
Gardner, Fred V.
McGraw-Hill, 1940
Buku Teks
Teguh Pudjo Muljono
BPFE-Yogyakarta , 1996
Buku Teks
Welsch, Glenn A., author
Salemba Empat, 2000
Buku Teks