This volume is the first bibliography to be published on the broad subject of cycles in humans and nature. The importance of cycles as a model for understanding the world is as old as the Bible and other ancient records of past civilizations. The modern investigation of diverse fields of study has resulted in the concept of cycles once again gaining center stage as an interdisciplinary model for reaching a better understanding of the nature of our universe. Major categories of cycles covered in this bibliography are: Astrophysics, Atmospheric Science, Biology, Botany, Geoscience, Medicine, Social Science, Zoology, and Interdisciplinary. Over 600 sources of information on thousands of cycles are carefully reviewed to enable the reader maximum access to the most substansive evidence for cycles in each field. A balance of general readings as well as more technical articles is maintained throughout the bibliography. An introduction provides an overview of the broad spectrum of information on cycles, indicating those areas of controversy as well as of agreement. The claims of cycles in social unrest, economics, and climatology are noted, as well as the more well-known cycles in biology, physiology, and medicine. The volume has an extensive table of contents to facilitate the location of many subcategories of cycles. An extensive index also enables the location of citations for specific researchers and for numerous subjects.