Walrecht B.J.J.R. (1961) Opmerkingen over de nestbouw en nestplaatskeuze van zwaluwen. ARDEA 49 (3-4): 164-175

no summary available The author considers details of nestbuilding with the House Martin (Delichon urbica) and the Swallow (Hirundo rustica). He compares the habits of nestbuilding with those of Petrochelidon pyrrhonata (= albifrons) especially with stress on the influences of the environment causing variety of nest shapes if the birds choose different nestsites.