APA (7th ed.) Citation

Heikkinen, M. (1981). Solving the shape of the earth by using digital density models.

Chicago Style (17th ed.) Citation

Heikkinen, Markku. Solving the Shape of the Earth by Using Digital Density Models. Helsinki, 1981.

MLA (9th ed.) Citation

Heikkinen, Markku. Solving the Shape of the Earth by Using Digital Density Models. 1981.

Warning: These citations may not always be 100% accurate.