Hickey, Michael
Cambridge University Press, 1981
Buku Teks SO
Hutchinson, J.
At The Clarendon Press, 1967
Buku Teks SO
Benson, Lyman
D.C. Heath , 1957
Buku Teks SO
Ivan Widjanarko
Fakultas Teknik Universitas Indonesia, 2022
UI - Skripsi Membership
Radford, Albert E.
Harper and Row, 1986
Buku Teks