Cita APA (7a ed.)

Hazekamp, J. (2011). Why before how: Singapore math computation strategies. Crystal Springs Books.

Cita Chicago Style (17a ed.)

Hazekamp, Jana. Why Before How: Singapore Math Computation Strategies. Peterborough, N.H.: Crystal Springs Books, 2011.

Cita MLA (9a ed.)

Hazekamp, Jana. Why Before How: Singapore Math Computation Strategies. Crystal Springs Books, 2011.