Παραπομπή σε μορφή APA (7η εκδ.)

Nkwake, A. M. (2015). Credibility, Validity, and Assumptions in Program Evaluation Methodology (1st ed. 2015.). Springer International Publishing : Imprint: Springer.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Nkwake, Apollo M. Credibility, Validity, and Assumptions in Program Evaluation Methodology. 1st ed. 2015. Cham: Springer International Publishing : Imprint: Springer, 2015.

Παραπομπή σε μορφή MLA (8th εκδ.)

Nkwake, Apollo M. Credibility, Validity, and Assumptions in Program Evaluation Methodology. 1st ed. 2015. Springer International Publishing : Imprint: Springer, 2015.