Halsey, R.W. 2004. In search of allelopathy: an eco-historical view of the investigation of chemical inhibition in California coastal sage scrub and chamise chaparral. Journal of the Torrey Botanical Society 131: 343-367. Send us an email to request a copy.
Finkenthal, D, B. Greco, R. Halsey, L. Pena, S. Rodecker, B. Simms, R.L. Lee, J. Lohr, M.J. Schaffer, and D.P. Schissel. 1996. Introduction to the Electromagnetic Spectrum. General Atomics, San Diego, CA. 96 p.
NPR's Living Earth. May 2, 2008. When you go into a national forest, you expect to see trees, but in southern California the forests are covered with shrubby plants known as chaparral. Living on Earth's Ingrid Lobet visits San Bernardino National Forest and talks with scientists who are trying to protect the dry vegetation. Listen to the audio.