APA
ANDREESCU T., Roger Nelsen, . (1999). Mathematical Olympiads 1998-1999. Washington, DC: The Mathematical Association of America.
Chicago
ANDREESCU Titu, Roger Nelsen, . 1999. Mathematical Olympiads 1998-1999. Washington, DC: The Mathematical Association of America.
Harvard
ANDREESCU T., Roger Nelsen, . (1999). Mathematical Olympiads 1998-1999. Washington, DC: The Mathematical Association of America.
MLA
ANDREESCU Titu, Roger Nelsen, . Mathematical Olympiads 1998-1999. Washington, DC: The Mathematical Association of America. 1999.