Willig, S. H. (2001). Good manufacturing practices for pharmaceuticals: A plan for total quality control from manufacturer to consumer (Fifth edition, rev. and expanded.). M. Dekker.

Willig, Sidney H. Good Manufacturing Practices for Pharmaceuticals: A Plan for Total Quality Control from Manufacturer to Consumer. Fifth edition, rev. and expanded. New York: M. Dekker, 2001.

Willig, Sidney H. Good Manufacturing Practices for Pharmaceuticals: A Plan for Total Quality Control from Manufacturer to Consumer. Fifth edition, rev. and expanded. M. Dekker, 2001.