Marcel Dekker, 1988
Buku Teks
Pisoiu, Daniela
Routledge, Taylor & Francis Group, 2018
Buku Teks
Goh Chok Tong
Ministry of Information, Communications and the Arts, 2004
Buku Teks
White, Jonathan R., 1975-2012
Wadsworth and Cengage Learning, 2012
Buku Teks
Martin, Gus
Sage, 2019
Buku Teks