Huisman, A. (2012). Spherical Bird Observatory: A former bunker of the Dutch Waterline was turned into a bird observatory. Topos.
Style de citation Chicago (17e éd.)Huisman, Arie. "Spherical Bird Observatory: A Former Bunker of the Dutch Waterline Was Turned into a Bird Observatory." Topos 2012.
Style de citation MLA (8e éd.)Huisman, Arie. "Spherical Bird Observatory: A Former Bunker of the Dutch Waterline Was Turned into a Bird Observatory." Topos, 2012.
Attention : ces citations peuvent ne pas être correctes à 100%.