PARR, E. .. (1987). INDUSTRIAL CONTROL HAND BOOK TRANSDUCERS. INDUSTRIAL PRESS.
Lua i Stíl Chicago (17ú heag.)PARR, E .A. INDUSTRIAL CONTROL HAND BOOK TRANSDUCERS. NEW YORK: INDUSTRIAL PRESS, 1987.
Lua MLA (9ú heag.)PARR, E .A. INDUSTRIAL CONTROL HAND BOOK TRANSDUCERS. INDUSTRIAL PRESS, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.