Conference on Origins of Life Elkridge, Md, Interdisciplinary Communications Program, & Margulis, L. (1973). Proceedings of the fourth Conference on Origins of Life: Chemistry and radioastronomy. Springer-Verlag.

Conference on Origins of Life Elkridge, Md, Interdisciplinary Communications Program, and Lynn Margulis. Proceedings of the Fourth Conference on Origins of Life: Chemistry and Radioastronomy. New York: Springer-Verlag, 1973.

Conference on Origins of Life Elkridge, Md, et al. Proceedings of the Fourth Conference on Origins of Life: Chemistry and Radioastronomy. Springer-Verlag, 1973.