W.P. · W. Perkins · William Eric Perkins · Wilmert E. Perkins
Cengage Learning · South-Western College Publications
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Punctuation, a programmed approach | 978-0-538-05460-7 (0-538-05460-3) | 1972 | |
| Punctuation: A Simplified Approach | 978-0-324-55754-1 (0-324-55754-X) | 2008 | Jane Johansen |
| Punctuation, a Simplified Approach | 978-0-324-26495-1 (0-324-26495-X) | 2002 | |