APA Style

Stoeppler, M, E, A. (2001). Reference materials for chemical analysis: certification, availability and proper usage . Weinheim, Germany: Willey-VCH.

MLA Style

Stoeppler, Markus;, Et, Al.. "Reference materials for chemical analysis: certification, availability and proper usage". Weinheim, Germany: Willey-VCH, 2001. Buku.