Cita APA (7th ed.)

Huisman, A. (2012). Spherical Bird Observatory: A former bunker of the Dutch Waterline was turned into a bird observatory. Topos.

Cita Chicago (17th ed.)

Huisman, Arie. "Spherical Bird Observatory: A Former Bunker of the Dutch Waterline Was Turned into a Bird Observatory." Topos 2012.

Cita MLA (8th ed.)

Huisman, Arie. "Spherical Bird Observatory: A Former Bunker of the Dutch Waterline Was Turned into a Bird Observatory." Topos, 2012.