Miller, Abraham H.
Westview Press, 1980
Buku Teks
Marcel Dekker, 1988
Buku Teks
Pisoiu, Daniela, author
Routledge, Taylor & Francis Group, 2018
Buku Teks
Goh Chok Tong, author
Ministry of Information, Communications and the Arts, 2004
Buku Teks
White, Jonathan R., 1975-2012, author
Wadsworth and Cengage Learning, 2012
Buku Teks