Al-Qasem, Anis
Graham and Trotman Limited Sterling House, 1985
Buku Teks
R. Mansury, author
Asian-Pasific Tax and Investment Research Centre, 1992
Buku Teks
Muhammad Suryanegara, author
Faculty of Engineering, Universitas Indonesia, 2012
Artikel Jurnal
Webb, James, author
Bantam Books, 1985
Buku Teks
Etten, G.M. van
Van Gorcum, 1976
Buku Teks