HAGGINS,L.R. (1977). MAINTENANCE ENGG.HD.BK. MC GRAW HILL.
Lua i Stíl Chicago (17ú heag.)HAGGINS,L.R. MAINTENANCE ENGG.HD.BK. NEW YORK: MC GRAW HILL, 1977.
Lua MLA (9ú heag.)HAGGINS,L.R. MAINTENANCE ENGG.HD.BK. MC GRAW HILL, 1977.
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