APA (7th ed.) Citation

Bell, E. T. (1964). The time stream.: The greatest adventure. The purple sapphire. Three science-fiction novels. Dover Publications.

Chicago Style (17th ed.) Citation

Bell, Eric Temple. The Time Stream.: The Greatest Adventure. The Purple Sapphire. Three Science-fiction Novels. New York: Dover Publications, 1964.

MLA (9th ed.) Citation

Bell, Eric Temple. The Time Stream.: The Greatest Adventure. The Purple Sapphire. Three Science-fiction Novels. Dover Publications, 1964.