Παραπομπή APA

Layder, D. (2018). Investigative research: Theory and practice. Sage.

Παραπομπή Chicago Style

Layder, Derek. Investigative Research: Theory and Practice. London: Sage, 2018.

Παραπομπή MLA

Layder, Derek. Investigative Research: Theory and Practice. Sage, 2018.