Frankel, Joseph
Oxford University Press, 1964
Buku Teks
Wright, Quincy, author
Appleton-Century-Crofts, 1955
Buku Teks
Forsythe, David P., 1941-, author
Cambridge University Press, 2012
Buku Teks
Orient Longman, 2005
Buku Teks
Synne L. Dyvik, Jan Selby and Rorden Wilkinson, editora
Routledge, Taylor & Francis Group, 2017
Buku Teks