This bibliography has as its chief aim: 1) expanding the availability of work related to the theory and research on play through topical listings of books and disciplines; 2) facilitating retrieval of cogent works on play through topical listings of books and articles in specialized disciplines; 3) exposing common research problems and innovative methods of studying play in hopes of fostering greater collaboration; and, 4) facilitating integration of theory and research on play. It attempts to provide a useful tool in selecting relevant references to play within the disciplines of medicine, psychology, sociology, anthropology, psychiatry, education, physical education and recreation, health, child development, rehabilitation, philosophy, religion and ancillary fields. Within each discipline area, entries are arranged by author. The coverage is extensive, though not comprehensive, up to August 1970. The large majority of references are from the United States, Great Britain, and Canada. The scope has been limited to references where the knowledge or use of play contributes to an understanding of human behavior. Items related to play as a therapeutic technique or to the use of play-related therapy in behavior modification programs are excluded. Time limitations precluded the generation of subject and author indices, however, a brief topical guide is provided. (Author/JLB)