Fogel, Robert William, author
Johns Hopkins Press, 1964
Buku Teks
Klein, Lawrence R., author
Basil Blackwell Publisher , 1985
Buku Teks
Mirer, Thad W., author
Macmillan, 1990
Buku Teks
Davis, Lance E., author
Richard D. Irwin, 1965
Buku Teks
Chow, Gregory C., author
McGraw-Hill, 1983
Buku Teks