Halley's Comet

NASA JPL (Caltech) (n.d.). Halley's Comet — JPL Small-Body Database. NASA JPL (Caltech). https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html

@misc{cite:jpl-comet-halleys-comet,
  title        = {Halley's Comet — JPL Small-Body Database},
  organization = {NASA JPL (Caltech)},
  year         = {n.d.},
  url          = {https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html},
  note         = {Orbit and physical data for Halley's Comet.}
}

NASA (n.d.). Halley's Comet — NASA Science. NASA. https://science.nasa.gov/

@misc{cite:nasa-comet-halleys-comet,
  title        = {Halley's Comet — NASA Science},
  organization = {NASA},
  year         = {n.d.},
  url          = {https://science.nasa.gov/},
  note         = {NASA overview of Halley's Comet.}
}