Byrns, Ralph T
Exploring economics/ Ralph T. Byrns, Gerald W. Stone
Scott Foresman, 1984
Buku Teks SO
Byrns, Ralph T.
Economics/ Ralph T. Byrns, Gerald W. Stone
Illinois, 1984
Buku Teks SO
Wright, Philip G.
The American tariff and oriental trade
University of Chicago Press, 1931
Buku Teks
The Random House American everyday dictionary
edited by Jess Stein
Random House, 1961
Buku Referensi
The work of the American library association
Artikel Jurnal