Cita APA (7a ed.)

Heiskanen, W. (1959). Topographic-isostatic reduction maps for europe and north atlantic in the hayford zones 18-1 for the airy-heiskanen system, t= 30 km and 20 km. Suomalainen Tiedeakatemia.

Cita Chicago Style (17a ed.)

Heiskanen, W. Topographic-isostatic Reduction Maps for Europe and North Atlantic in the Hayford Zones 18-1 for the Airy-heiskanen System, T= 30 Km and 20 Km. Helsinki: Suomalainen Tiedeakatemia, 1959.

Cita MLA (8a ed.)

Heiskanen, W. Topographic-isostatic Reduction Maps for Europe and North Atlantic in the Hayford Zones 18-1 for the Airy-heiskanen System, T= 30 Km and 20 Km. Suomalainen Tiedeakatemia, 1959.