Piersma, Theunis (6 november 1998). ”A New Pressure Sensory Mechanism for Prey Detection in Birds: The Use of Principles of Seabed Dynamics?”. Proceedings: Biological Sciences "265" (1404): ss. 1377–1383. doi:10.1098/rspb.1998.0445.
Byrkjedal, Ingvar; Larsen, Tore; Moldsvor, Jostein (1989). ”Sexual and antagonistic behaviour of Bar-tailed godwits on the breeding grounds”. Ornis Scandinavica 20: sid. 169-175. doi:10.2307/3676909.