Armstrong, Karen
Serambi Ilmu Semesta , 2011
Buku Teks SO
[Publisher not identified], [Date of publication not identified]
Naskah
[Publisher not identified], [Date of publication not identified]
Naskah
Solichin Salam
Gema Salam, 1993
Buku Teks SO
Tomass, Mark, 1961-
Palgrave Macmillan, 2016
Buku Teks SO