APA (7th ed.) Citation

Ashford, D., & Collins, P. (1990). Your spaceflight manual: How you could be a tourist in space within twenty years. Headline Book Publishing.

Chicago Style (17th ed.) Citation

Ashford, David, and Patrick Collins. Your Spaceflight Manual: How You Could Be a Tourist in Space Within Twenty Years. London: Headline Book Publishing, 1990.

MLA (8th ed.) Citation

Ashford, David, and Patrick Collins. Your Spaceflight Manual: How You Could Be a Tourist in Space Within Twenty Years. Headline Book Publishing, 1990.