APA (7th ed.) Citation

Holmberg, E. A photographic photometry of extragalactic nebulae. Gleerup.

Chicago Style (17th ed.) Citation

Holmberg, Erik. A Photographic Photometry of Extragalactic Nebulae. Lund: Gleerup.

MLA (9th ed.) Citation

Holmberg, Erik. A Photographic Photometry of Extragalactic Nebulae. Gleerup.

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