Feynman, Richard P. (2011). "27–4 The ambiguity of the field energy". The Feynman lectures on physics. Volume 1: Mainly mechanics, radiation, and heat (The new millennium edition, paperback first published ed.). New York: Basic Books. ISBN978-0-465-04085-8. Archived from the original on 2024-10-03. Retrieved 2024-09-05.
Stern, Dr. David P.; Peredo, Mauricio (2001-11-25). "Magnetic Fields – History". NASA Goddard Space Flight Center. Archived from the original on 2015-11-16. Retrieved 2009-11-27.
Stern, Dr. David P.; Peredo, Mauricio (2001-11-25). "Magnetic Fields – History". NASA Goddard Space Flight Center. Archived from the original on 2015-11-16. Retrieved 2009-11-27.
Feynman, Richard P. (2011). "27–4 The ambiguity of the field energy". The Feynman lectures on physics. Volume 1: Mainly mechanics, radiation, and heat (The new millennium edition, paperback first published ed.). New York: Basic Books. ISBN978-0-465-04085-8. Archived from the original on 2024-10-03. Retrieved 2024-09-05.