Boren, Henry C., author
D.C. Heath, 1977
Buku Referensi
Boren, Henry C.
D.C Heath, 1977
Buku Teks
Raychoudhary, S.C.
Surjeet Publications, 1984
Buku Teks
Gregg, Pauline, author
George G. Harrap, 1952
Buku Teks
Giacca, Gilles, author
Oxford University press, 2014
Buku Teks