Gregory, Robert Henry, author
Wadsworth, 1963
Buku Teks
Gregory, Robert Henry, author
Chatto and Windus, 1963
Buku Teks
Orilia, Lawrence S., author
McGraw-Hill, 1982
Buku Teks
Alagar, Vangalur S., author
Prentice-Hall, 1989
Buku Teks
Burian, Barbara J., author
Prentice-Hall, 1982
Buku Teks