Freeman Bibliographical Database
| Identifier: | F362 |
| Date: | 1964 |
| Concise reference: | Darwin, C. R. 1964. On the tendency of species to form varieties, in Thomas J. Hall, A source book in animal biology, pp. 607-627. New York: Hafner. |
| Detailed reference: | 362. 1964 New York, Hafner. As F355. |