Gaya APA
Greitzer, S, L. (1978).
International Matematical Olympiads 1959-1977 .
Washington DC:
Mathematical Association of America.
Gaya MLA
Greitzer, Samuel, L.
"International Matematical Olympiads 1959-1977".
Washington DC:
Mathematical Association of America,
1978.
BUKU PENGAYAAN.