Saso, Mary
Abt Books, 1982
Buku Teks
Basil Blackwell for the United Nations Industrial Development Organization, 1991
Buku Teks
Published by B. Blackwell for the United Nations Industrial Development Organization, 1990
Buku Teks
Vance, Stanley C.
Prentice-Hall, 1961
Buku Teks
Mund, Vernon A.
Appleton-Century-Crofts, 1971
Buku Teks