[1]   POLYA, George - How to Solve It: a new aspect of mathematical method. With a new foreword by John Conway. United States of America: Expanded Princeton Science Library Edition, 2004.

[2]   DAVIS, Philip J., HERSH, Reuben, MARCHISOTTO, Elena Anne - The Companion Guide to The Mathematical Experience Study Edition. United States of America: Birkhauser, 1995.

[3]   MACHIAVELO, A., REIS, R. - Ainda o totobola, Boletim da SPM 62 (2010) 37-48.

[4]   MACHIAVELO, A., REIS, R. - O problema do totobola, Boletim da SPM 61 (2009) 39-45.