Gaya APA

Smith, P, L. (2001). A Primer for Sampling Solids, Liquids, and Gases : Based on the Seven Sampling Errors of Pierre Gy . Philadelphia: American Statistical Association.

Gaya MLA

Smith, Patricia, L.. "A Primer for Sampling Solids, Liquids, and Gases : Based on the Seven Sampling Errors of Pierre Gy". Philadelphia: American Statistical Association, 2001. Text.