Cita APA (7a ed.)

Earle, J. L. (1987). Higher grade and standard grade (1. publ.). Juta.

Cita Chicago Style (17a ed.)

Earle, J. L. Higher Grade and Standard Grade. 1. publ. Cape Town [u.a.]: Juta, 1987.

Cita MLA (9a ed.)

Earle, J. L. Higher Grade and Standard Grade. 1. publ. Juta, 1987.