APA (7th ed.) Citation

Nielsen, A. v. (1964). Contributions to the history of the Hertzsprung-Russell Diagram.

Chicago Style (17th ed.) Citation

Nielsen, Axel von. Contributions to the History of the Hertzsprung-Russell Diagram. 1964.

MLA (9th ed.) Citation

Nielsen, Axel von. Contributions to the History of the Hertzsprung-Russell Diagram. 1964.

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