APA (7th ed.) Citation

Kruijf, C. d. Guarding the underground. Series of 5 photos.

Chicago Style (17th ed.) Citation

Kruijf, Co de. Guarding the Underground. Series of 5 Photos.

MLA (8th ed.) Citation

Kruijf, Co de. Guarding the Underground. Series of 5 Photos.

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