Allen, B.L.
W.H. Preman, 1970
Buku Teks SO
Baker, John Fleetwood
Cambridge University Press, 1963
Buku Teks SO
Baker, John Fleetwood
Cambridge University Press, 1963
Buku Teks SO
Bhattacharya, Vidhushekhera
University of Calcuta, 1939
Buku Teks SO
Tortora, Gerard J.
John Wiley & Sons, 2006
Buku Referensi