G. Ridenour

发表

R. Speakman, P. Sheppard, M. Witten, 2007, Environmental monitoring and assessment.

D. Helsel, R. Speakman, P. Sheppard, 2012, Chemico-biological interactions.

Paul R. Sheppard, Robert J. Speakman, Mark L. Witten, 2007, Environmental health perspectives.

Simon S. Wong, P. Sheppard, N. Sun, 2003, Toxicology and industrial health.

Calvin A. Farris, M. Glascock, R. Speakman, 2007, Environmental geochemistry and health.

Kent Rhodes, P. Sheppard, M. Witten, 2007, Microscopy and Microanalysis.