APA (7th ed.) Citation

Steene, G. C. M. V. d. (1995). Obscured planetary nebulae.

Chicago Style (17th ed.) Citation

Steene, Griet Clara Maurits Van de. Obscured Planetary Nebulae. 1995.

MLA (9th ed.) Citation

Steene, Griet Clara Maurits Van de. Obscured Planetary Nebulae. 1995.

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