Strunk, William, author
Pearson Education, 2014
Buku Teks
edited by Jonathan Culpeper, Mick Short, and Peter Verdonk
Routledge, 1998
Buku Teks
Graves, Robert, author
Macmillan, 1943
Buku Referensi
Summers, Vivian, author
Penguin Books, 1991
Buku Teks
Fairbairn, Gavin, author
McGraw-Hill, 2012
Buku Teks