Yayasan Obor Indonesia, 2005
Buku Teks
Pakpahan, Beginda, author
Penerbit Buku Kompas, 2018
Buku Teks
edited by Roy C. Macridis
Prentice-Hall, 1992
Buku Teks
Cambridge University Press, 2021
eBooks
Lamchek, Jayson S., author
Cambridge University Press, 2019
eBooks