Smith, Daniel
Michael O'Mara Books Limited, 2021
Buku Teks SO
Smith, Daniel
Michael O'Mara Books Limited, 2015
Buku Teks
McGraw-Hill, [date of publication not identified]
Buku Teks
Flesch, Rudolf
Harper & Brothetrs, 1960
Buku Teks
Morgan, Mary S., 1952-2011
Cambridge University Press, 2012
Buku Teks