Progress Publishers, [date of publication not identified]
Buku Referensi
Dunn, John A., 1949-
Routledge, 2009
Buku Teks SO
Dunn, John, 1940-
Routledge, 2009
Buku Referensi
Gottlieb, Irving M.
Newnes, 1997
Buku Referensi
Gottlieb, Irving M.
Newnes, 1997,
Buku Referensi