APA
Headstrom R., . (1978). The families of flowering plants. South Bruns: A. S. Barnes.
Chicago
Headstrom Richard, . 1978. The families of flowering plants. South Bruns: A. S. Barnes.
Harvard
Headstrom R., . (1978). The families of flowering plants. South Bruns: A. S. Barnes.
MLA
Headstrom Richard, . The families of flowering plants. South Bruns: A. S. Barnes. 1978.