Keynote Address to the Symposium of Marine Mammals of the Indian Ocean, arranged by the National Aquatic Resources Agency, Sri Lanka, at Mount Lavinia Hotel, 22 February 1983.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| February 1984 |
|
1984: Spring / A Choice of Futures | Del Rey / Ballantine | Nonfiction | 239 |
| July 1984 |
|
1984: Spring - A Choice of Futures | Granada | Nonfiction | 248 |