Mark Leikin
Springer, 2012
eBooks
Lambert, Wallace E., author
Stanford University press, 1972
Buku Teks
edited by Howard Giles and W. Peter Robinson
John Wiley & Sons, 1990
Buku Referensi
edited by Oscar Uribe-Villegas
Mouton, 1977
Buku Teks
Noor Azam Haji-Othman, author
ISEAS/BUFS, 2016
Artikel Jurnal