Tohutoro APA (7th ed.)
Sotheby's. (1997). Sotheby's: London, 6 and 7 March 1997 : Good Clocks, Watches, Wristwatches, Barometers, Mechanical Music and Scientific Instruments. Sotheby's.
Tohutoru Kātū Chicago (17th ed.)
Sotheby's. Sotheby's: London, 6 and 7 March 1997 : Good Clocks, Watches, Wristwatches, Barometers, Mechanical Music and Scientific Instruments. Londres, Inglaterra: Sotheby's, 1997.
Tohutoro MLA (9th ed.)
Sotheby's. Sotheby's: London, 6 and 7 March 1997 : Good Clocks, Watches, Wristwatches, Barometers, Mechanical Music and Scientific Instruments. Sotheby's, 1997.
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