Gaya APA

Salkind, C, T. (1966). The Contest Problem Book II: Annual High School Contests 1961 - 1965 . Washington DC: The Mathematical Association of America.

Gaya MLA

Salkind, Charles, T. "The Contest Problem Book II: Annual High School Contests 1961 - 1965". Washington DC: The Mathematical Association of America, 1966. Digital Book.