The UFO Encyclopedia
| Compiled by | John Spencer (2) |
| Editor | John Spencer (2) |
| Publisher | Guild Publishing |
| Copyright Holder | John Spencer (2) |
| First Published by | Headline Book Publishing |
| Typeset by | Colset Private Limited |
| Printed and Bound by | Richard Clay Ltd |
| Format | Hardback |
| Language | English |
| Copyright | 1991 |
| This Edition Published | 1991 |
| Pages / Font | 340 pages |
| Other | CN 1302 |
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