Cita APA (7th ed.)

Eko, E. E. (1999). Effective writing. Heinemann Educational Books.

Cita Chicago (17th ed.)

Eko, Ebele E. Effective Writing. Heinemann Educational Books, 1999.

Cita MLA (9th ed.)

Eko, Ebele E. Effective Writing. Heinemann Educational Books, 1999.

Atenció: Aquestes cites poden no estar 100% correctes.