Author's Last Name, Initials. (Year). Book title. Publisher.
Roach, M. (2010). Packing for Mars: The curious science of life in the void. W. W. Norton.
Author’s Last Name, Initials. (Year). Article title. Journal Title, volume(issue), page-range. URL
Okon, E., & Sudarsky, D. (2018). Losing stuff down a black hole. Foundations of Physics, 48(4), 411-428. https://doi.org/10.1007/s10701-018-0154-3
Author’s Last Name, Initials. (Year, Month Day). Page title. Name of Website. URL
Howell, E. (2018, March 30). Exoplanets: Worlds beyond our solar system. Space.com. https://www.space.com/17738-exoplanets.html