Various. Scientific American Supplement, No. 441, June 14, 1884.
Cita Chicago (17th ed.)Various. Scientific American Supplement, No. 441, June 14, 1884.
Cita MLA (9th ed.)Various. Scientific American Supplement, No. 441, June 14, 1884.
Atenció: Aquestes cites poden no estar 100% correctes.