Hill, P. H. (1970). The Science Of Engineering Design / Percy H. Hill. Holt.
Lua i Stíl Chicago (17ú heag.)Hill, Percy H. The Science Of Engineering Design / Percy H. Hill. Holt, 1970.
Lua MLA (8ú heag.)Hill, Percy H. The Science Of Engineering Design / Percy H. Hill. Holt, 1970.
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