Nyström, K. G. K. (1999). Foraging in relation to aspects of morphology, body condition, reproduction, and habitat variability in three bird species. Göteborg University, Faculty of Natural Sciences.

Nyström, Kjell Gunnar Kenneth. Foraging in Relation to Aspects of Morphology, Body Condition, Reproduction, and Habitat Variability in Three Bird Species. Göteborg: Göteborg University, Faculty of Natural Sciences, 1999.

Nyström, Kjell Gunnar Kenneth. Foraging in Relation to Aspects of Morphology, Body Condition, Reproduction, and Habitat Variability in Three Bird Species. Göteborg University, Faculty of Natural Sciences, 1999.