edited by V.A. Filov, A.L. Bandman and B.A. Ivin
Ellis Horwood, 1993
Buku Teks SO
Zudin, Yuri B.
Springer, 2011
eBooks
Chin Long Chiang
Robert E. Krieger Publ., 1984
Buku Teks
Paris : UNESCO
Majalah, Jurnal, Buletin
Holmes, Oliver Wendell
Walter Scott, [Date of publication not identified]
Buku Teks SO