Petersen, William, author
Macmillan, 1961
Buku Teks
Petersen, William, author
Macmillan, 1969
Buku Teks
Petersen, William, author
Macmillan, 1969
Buku Teks
Hock, Oo Yu
UMCB Publication, 1980
Buku Teks
Leibniz, Wilhelm Gottfried
Penguin Book, 1954
Buku Teks