APA (7th ed.) Citation

Al-Khalili, J. (1999). Black holes, wormholes & time machines. Institute of Physics Pub..

Chicago Style (17th ed.) Citation

Al-Khalili, Jim. Black Holes, Wormholes & Time Machines. Bristol, UK ; Philadelphia, PA: Institute of Physics Pub., 1999.

MLA (8th ed.) Citation

Al-Khalili, Jim. Black Holes, Wormholes & Time Machines. Institute of Physics Pub., 1999.

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