Sabado, F. P. Paradoxes as learning activities for High School Mathematics.
Chicago-referens (17:e uppl.)Sabado, Federico P. Paradoxes as Learning Activities for High School Mathematics. Quezon City, 1979.
MLA-referens (9:e uppl.)Sabado, Federico P. Paradoxes as Learning Activities for High School Mathematics.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.