Winter, Yoad
Edinburgh University Press, 2016
Buku Teks SO
Dwi Indah Rahmawati
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2012
UI - Skripsi Open
Berlo, David K.
Holt, Rinehart and Winston, 1960
Buku Teks SO
edited by Carl H. Heidrich
American Elsevier Publishing Company, 1974
Buku Teks SO
Vanderveken, Daniel
Cambridge University Press, 1990
Buku Teks SO