McGraw-Hill, 1953
Buku Teks
Stonier, Alfred W.
Longman Group Limited, 1980
Buku Teks
Townsed, Ralph
G.P. Putnam's Sons, 1933
Buku Teks
Buchanan, James M., author
Liberty Fund, Inc., 2000
Buku Referensi
KNight, Bruce Winton
Alfred A. Knoff , 1952
Buku Teks