APA (7th ed.) Citation

Zubrin,Robert. (1999). Entering Space: Creating A Spacefaring Civilization. Jeremy P. Tarcher/Putnam.

Chicago Style (17th ed.) Citation

Zubrin,Robert. Entering Space: Creating A Spacefaring Civilization. New York,USA: Jeremy P. Tarcher/Putnam, 1999.

MLA (9th ed.) Citation

Zubrin,Robert. Entering Space: Creating A Spacefaring Civilization. Jeremy P. Tarcher/Putnam, 1999.

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