David, Abe, author
Left Books Club, 1989
Buku Teks
Gower , 1986
Buku Teks
Todaro, Michael P., author
Ghalia Indonesia, 1983
Buku Teks
Todaro, Michael P., author
Gelora Aksara Pratama, 1993
Buku Teks
edited by Greg Crouch, Ted Wheelwright, Ted Wilshire
Penguin Books, 1980
Buku Teks