- Joe Rao (August 17, 2022). “In Memoriam: Famed ‘Comet Hunter’ Don Machholz dies at 69”. Space.com. Retrieved September 4, 2022.
- ^ “Famous amateur astronomer Donald Machholz died”. The Universe Space Tech. August 8, 2022. Retrieved August 27, 2022.
- ^ Jump up to:a b c Parks, Jake (August 10, 2022). “Donald Machholz, comet hunter and co-inventor of Messier marathon, dies at age 69”. Astronomy. Archived from the original on August 12, 2022. Retrieved August 15, 2022.
- ^ “Don Machholz, 1952–2022”. EarthSky.org. August 9, 2022. Retrieved August 11, 2022.
- ^ Joe Rao (August 12, 2022). “Remembering Donald Machholz, 1952 – 2022”. Sky & Telescope. Retrieved September 4, 2022.
- ^ Gus Thomson (March 30, 2010). “Patience leads to new comet discovery by Colfax amateur astronomer”. Auburn Journal. Retrieved March 30, 2010.
- ^ Roger W. Sinnott (March 27, 2010). “New Comet Machholz”. Sky & Telescope. Retrieved March 30, 2010.
- ^ “Amateur Astronomer Nails Down His Second Comet”. Los Angeles Times. Associated Press. June 16, 1985. Retrieved December 29, 2016.
- ^ Alan MacRobert (December 2, 2008). “A Very Oddball Comet”. Sky & Telescope. Retrieved December 2, 2008.
- ^ “Small-Body Database Lookup”.
- Associated Press (June 16, 1985) “Amateur Astronomer Nails Down His Second Comet” Los Angeles Times Retrieved December 29, 2016
- Jet Propulsion Laboratory (October 14, 1994) “MACHHOLZ’S BANNER YEAR” Jet Propulsion Laboratory
- Library of Congress (2002) “Machholz, Don 1952–” Library of Congress
- Joe Rao (September 17, 2004) “Newfound Comet Set for Winter Display” Space.com
- Debi Drake (May 22, 2005) “Meet The Comet Hunter: Don Machholz” American Profile AMG/Parade
- Alan MacRobert (December 2, 2008) “A Very Oddball Comet” Sky & Telescope Retrieved December 2, 2008
- Jeanna Bryner (December 2, 2008) “Odd Comet Possibly from Another Star System” Space.com
- Roger W. Sinnott (March 27, 2010) “New Comet Machholz” Sky & Telescope Retrieved March 30, 2010.
- Brooks Hays (November 3, 2017) “SOHO Spacecraft Spots Comet Machholz 96P, A Return Visitor” UPI
- Gareth V. Williams (November 11, 2018) “MPEC 2018-V151: COMET C/2018 V1 (Machholz-Fujikawa-Iwamoto)” Minor Planet Center.
- Bob King (November 9, 2018) “Amateur Don Machholz Discovers His 12th Comet!” Sky & Telescope
- MPEC 2018-V151: COMET C/2018 V1 (Machholz-Fujikawa-Iwamoto)
- Bob King (November 11, 2018) Arizona Amateur Discovers New Dawn Comet — Here’s How To Find It
- Comet C/2018 V1 (Machholz-Fujikawa-Iwamoto) Sky Charts and Coordinates
- JPL viewer NASA
