↑ Charles Knight, ed. (1858). "Westmacott, Sir Richard, R.A.". The English Cyclopedia. Biography – Volume 6. London: Bradbury and Evans. p.653.
↑ Lee A. Vedder (2006). John James Audubon and The Birds of America: A Visionary Achievement in Ornithological Illustration. Huntington Library. p.32. ISBN9780873282178.
↑ Sears, Donald A. (1978). John Neal. Boston, Massachusetts: Twayne Publishers. pp.116–117. ISBN080-5-7723-08.
↑ Edgar Preston Richardson; Brooke Hindle; Lillian B. Miller (1983). Charles Willson Peale and His World. H.N. Abrams. ISBN9780810914780.
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