APA (7th ed.) Citation

Wielen, R. (1963). Research on clustering of galaxies. ASTIA document.

Chicago Style (17th ed.) Citation

Wielen, Roland. "Research on Clustering of Galaxies." ASTIA Document 1963.

MLA (9th ed.) Citation

Wielen, Roland. "Research on Clustering of Galaxies." ASTIA Document, 1963.

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