Tracklist Hide Credits
| A | Knock, Knock Who's There ?Written-By – G. Stephens*, J. Carter* |
| B | I'm Going To Fall In Love AgainWritten-By – Cyril Ornadef*, Hal Shaper |
Companies, etc.
- Published By – See Saw Music Ltd.
- Published By – Aviva Music Ltd.
- Published By – Sparta Music Ltd.
Credits
- Producer – Mickie Most
Notes
Label variation with different publishers.Apple company sleeve.
The U.K. entry for The Eurovision Song Contest 1970.
Mary Hopkin came 2nd in the contest, being beaten by Dana - All Kinds Of Everything
Barcode and Other Identifiers
- Matrix / Runout (Side A Stamped Run-out): APPLE 26 A - 1U KT
- Matrix / Runout (Side B Stamped Run-out): APPLE 26 B - 1U KT
Other versions
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| APPLE 26 | Mary Hopkin | A Song For Europe (7", Single) | Apple Records | APPLE 26 | UK | 1970 |
| APPLE 26 | Mary Hopkin | Knock, Knock Who's There (7", Single) | Apple Records | APPLE 26 | Denmark | 1970 |
| APPLE-9105 | Mary Hopkin | Knock, Knock Who's There ? (7", Single) | Apple Records | APPLE-9105 | Australia | 1970 |
| APPLE 26 | Mary Hopkin | Knock, Knock Who's There ? (7", Single, Sol) | Apple Records | APPLE 26 | UK | 1970 |
| H 588, H - 588 | Mary Hopkin | Eurovision '70 - Toc Toc, ¿Quien Hay? (7", Single) | Apple Records, Hispavox | H 588, H - 588 | Spain | 1970 |
