n/s · Nicholas Savage · Nicholas Spike
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | 
|---|---|---|---|
| Forth - A Text and Reference | 978-0-13-326331-2 (0-13-326331-2) | 1986 | Mahlon G. Kelly | 
| FORTH: A Text and Reference | 978-0-13-326349-7 (0-13-326349-5) | 1986 | Mahlon Kelly |