Larsen-Freeman, Diane
Longman , 1992
Buku Teks
Gass, Susan M., author
Routledge, 2017
Buku Teks
Saville-Troike, Muriel, 1936-, author
Cambridge University Press , 2006
Buku Teks
Saville-Troike, Muriel, 1936-, author
Cambridge University Press, 2012
Buku Teks
edited by Jessica Williams and Bill Van Patten
NY : Routledge, 2015
Buku Teks