C.A. Qadar
Pakistan Philosophical Congress, 1965
Buku Teks SO
Charlotta Hillerdal, Johannes Siapkas, editors
Routledge, 2015
Buku Teks
Johnson, Carol
Allen and Unwin, 1989
Buku Teks
Zainah Anwar
Yayasan Mohamed Noah; Petaling Jaya, Selangor, Malaysia , 2011
Buku Referensi
Bailey, Cyril
Oxford University Press, 1951
Buku Teks