Naft, S., & De Sola, R. (1961). International conversion tables: Weights - measures - gauges - currencies conversion equivalents and factors technical units - alphabets, other useful information ([2nd ed.].). Duell.
Lua i Stíl Chicago (17ú heag.)Naft, Stephen, agus Ralph De Sola. International Conversion Tables: Weights - Measures - Gauges - Currencies Conversion Equivalents and Factors Technical Units - Alphabets, Other Useful Information. [2nd ed.]. New York: Duell, 1961.
Lua MLA (8ú heag.)Naft, Stephen, agus Ralph De Sola. International Conversion Tables: Weights - Measures - Gauges - Currencies Conversion Equivalents and Factors Technical Units - Alphabets, Other Useful Information. [2nd ed.]. Duell, 1961.
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