Roy, W., & Elizabeth, P. S. (1987). Designing portable computerized intruments. Tab Books.
Lua i Stíl Chicago (17ú heag.)Roy, William, agus Penrose Sandra Elizabeth. Designing Portable Computerized Intruments. Tab Books, 1987.
Lua MLA (8ú heag.)Roy, William, agus Penrose Sandra Elizabeth. Designing Portable Computerized Intruments. Tab Books, 1987.
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