| Trích dẫn | Stiles, F.G., 1984 Status and conservation of seabirds in Costa Rican waters. In Croxall, J.P., Evans, P.G.H. and Schreiber, R.W. (eds.), Status and Conservation of the World's Seabirds. ICBP Technical Publication 2:223-229. |
| Tài liệu tham khảo | 5856 Stiles, F.G., 1984 |
| Trang | |
| Named Used as Valid | Larus delawarensis |
| Địa phương | |
| Distribution | Costa Rica. |