APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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