Gaya APA

Punk, W. et al (2007). Quality Assurance in Analytical Chemistry, 2nd Ed. (2nd Ed.). : Wiley-VCH Verlag.

Gaya MLA

Punk, Werner. et al. "Quality Assurance in Analytical Chemistry, 2nd Ed.". 2nd Ed. : Wiley-VCH Verlag, 2007. Text.