Παραπομπή APA

Kallen, A. (2011). Understanding biostatistics. John wiley and sons.

Παραπομπή Chicago Style

Kallen, Anders. Understanding Biostatistics. Sussex: John wiley and sons, 2011.

Παραπομπή MLA

Kallen, Anders. Understanding Biostatistics. John wiley and sons, 2011.