| Citation | Enticott, J. and D. Tipling, 1997 Seabirds of the World: the complete reference. Singapore: New Holland (Publishers) Ltd. 234 p. |
| Ref. | 84934 Enticott, J. and D. Tipling, 1997 |
| Page | 112 |
| Named Used as Valid | Sula variegata |
| Locality | |
| Distribution | Peru and Chile. |