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Baris 15:
* [https://books.google.com/books?id=T-QDAAAAMBAJ&pg=-PA45&dq=Popular+Science+1930+plane+%22Popular+Mechanics%22&hl=en&ei=JfVZToXuPMeisQKWip3KDA&sa=X&oi=book_result&ct=result&resnum=1&sqi=2&ved=0CCoQ6AEwAA#v=onepage&q&f=true "How Echoes Tell Depth of Water Under Ship" ''Popular Mechanics Monthly'', July 1930]
* ELAC (1982) ''An Introduction to Echosounding''. Honeywell-ELAC-Nautik GmbH, Kiel, 88 pp, [[hdl:10013/epic.44286.d001|(pdf 27.5 MB)]]
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[[Kategori:Instrumentasi oseanografi]]
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