| Paperback |
| author | Cal I. Pygaster | ||
| title | Knock Once to Swap [Novel] | ||
| series/number | An Adult Book / AB 1514 | ||
| publisher | Greenleaf Classics [Publications], Wilmington, Il. | ||
| year (pages) | 1970 | isbn | - |
| source | INT | country | USA |
| original | - | ||
| cover artist | Robert Bonfils | ||
| note | - | ||
| comments | - | ||
