Cita APA (7th ed.)

Howie, S. J. (2001). Mathematics and science performance in grade 8 in South Africa 1998/1999: TIMSS-R 1999 South Africa. Human Sciences Research Council.

Cita Chicago (17th ed.)

Howie, Sarah J. Mathematics and Science Performance in Grade 8 in South Africa 1998/1999: TIMSS-R 1999 South Africa. Pretoria, SA: Human Sciences Research Council, 2001.

Cita MLA (9th ed.)

Howie, Sarah J. Mathematics and Science Performance in Grade 8 in South Africa 1998/1999: TIMSS-R 1999 South Africa. Human Sciences Research Council, 2001.