Shimko, Keith L., 1962-
Cengage Learning, 2016
Buku Teks
Shimko, Keith L., 1962-
Wadsworth and Cengage Learning, 2013
Buku Teks
John Baylis, Steve Smith, Patricia Owens.
Oxford University Press, 2014
Buku Teks
Smith, Roy H.
Routledge, 2017
Buku Teks
Synne L. Dyvik, Jan Selby and Rorden Wilkinson, editora
Routledge, Taylor & Francis Group, 2017
Buku Teks