APA (7th ed.) Citation

Simmons, H. T. M. Z-Day on Centauri.

Chicago Style (17th ed.) Citation

Simmons, Henry T.; McWilliams. Z-Day on Centauri.

MLA (9th ed.) Citation

Simmons, Henry T.; McWilliams. Z-Day on Centauri.

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