Prepared at the request of the AAPT Committee on Resource Letters; supported by a grant from the National Science Foundation.This is one of a series of Resource Letters on different topics, intended to guide college physicists to some of the literature and other teaching aids that may help them improve course contents in specified fields of physics. No Resource Letter is meant to be exhaustive and complete; in time there may be more than one letter on some of the main subjects of interest. Comments and suggestions concerning the content and arrangement of letters as well as suggestions for future topics will be welcomed. Please send such communications to Professor Arnold Arons, Chairman Resource Letter Committee, Department of Physics, Amherst College, Amherst, Massachusetts.Notation:The letterEafter the item number means that the reference should be mainly useful forelementarycourses. In view of the complexity of the subject,elementarywill normally imply junior courses. The letterIindicatesintermediate(senior and first-year graduates) andAindicatesadvanced(second-year graduates and students beginning research in plasma physics).Additional copies:Available from American Institute of Physics, 335 East 45 Street, New York, New York 10017. When ordering, request Resource Letter PP-2 and enclose a stamped return envelope.