Huisman, A. (2012). Spherical Bird Observatory: A former bunker of the Dutch Waterline was turned into a bird observatory. Topos.
Čikaški stil citiranja (17. izdanje)Huisman, Arie. "Spherical Bird Observatory: A Former Bunker of the Dutch Waterline Was Turned into a Bird Observatory." Topos 2012.
MLA način citiranja (8. izdanje)Huisman, Arie. "Spherical Bird Observatory: A Former Bunker of the Dutch Waterline Was Turned into a Bird Observatory." Topos, 2012.
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