Ulfvens, J. (1988). Comparative breeding ecology of the horned grebe, podiceps auritus, and the great crested grebe, podiceps cristatus: Archipelago versus lake habitats. Finn. Zoolog. Publ. Board.
Chicago-Zitierstil (17. Ausg.)Ulfvens, Johan. Comparative Breeding Ecology of the Horned Grebe, Podiceps Auritus, and the Great Crested Grebe, Podiceps Cristatus: Archipelago Versus Lake Habitats. Helsinki: Finn. Zoolog. Publ. Board, 1988.
MLA-Zitierstil (9. Ausg.)Ulfvens, Johan. Comparative Breeding Ecology of the Horned Grebe, Podiceps Auritus, and the Great Crested Grebe, Podiceps Cristatus: Archipelago Versus Lake Habitats. Finn. Zoolog. Publ. Board, 1988.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.