APA (7th ed.) Citation

Chigbo, P. C. (1997). It's tragic: Contemporary problems of Nigeria. [publisher not identified].

Chicago Style (17th ed.) Citation

Chigbo, Peter C. It's Tragic: Contemporary Problems of Nigeria. [Place of publication not identified]: [publisher not identified], 1997.

MLA (9th ed.) Citation

Chigbo, Peter C. It's Tragic: Contemporary Problems of Nigeria. [publisher not identified], 1997.