Lee, George
Fong Brothers, 1989
Buku Teks
Lieberman, Marc
South-Wetern & Cengage Learning, 2013
Buku Teks
Lieberman, Marc
South Western Cengage Learning, 2013
Buku Teks
Bye, Raymond T.
Appleton-Century-Crofts, 1947
Buku Teks
Lipsey, Richard G.
Harper Collin, 1996
Buku Teks