| Authors(s) | Barrett R.T. and Anker-Nilssen T. |
| Year | 1997 |
| Title | Egg-laying, chick growth and food of Black Guillemots Cepphus grylle in North Norway. Fauna norv. Ser. C., Cinclus 20: 69-79 |
| Authors(s) | Barrett R.T. and Anker-Nilssen T. |
| Year | 1997 |
| Title | Egg-laying, chick growth and food of Black Guillemots Cepphus grylle in North Norway. Fauna norv. Ser. C., Cinclus 20: 69-79 |