Wilson, George P.
A guide to better english
F.S. Crofts, 1947
 Buku Teks
Yates, Paulene M.
Workbook and handbook : the new building better english / Paulene M. Yates, Edward N. de Laney
Harper & Row, 1962
 Buku Teks SO
English this way English Language Services.
London Collier-Macmillan 1965,
 Buku Teks
Hubbard, L. Ron, 1911-1986
The way to happiness : a common sense guide to better living.
L. Ron Hubbard Library, 2009
 Multimedia
Hubbard, L. Ron, 1911-1986
The way to happiness : a common sense guide to better living.
L. Ron Hubbard Library, 2009
 Multimedia