PARKER ,S P.,ED. (1982). MC GRAW HILL ENCYCLOPEDIA OF SCIENCE AND TECNOLOGY (INDEX). MCGRAW HILL BOOK CO.

PARKER ,S P.,ED. MC GRAW HILL ENCYCLOPEDIA OF SCIENCE AND TECNOLOGY (INDEX). NEW-YORK: MCGRAW HILL BOOK CO, 1982.

PARKER ,S P.,ED. MC GRAW HILL ENCYCLOPEDIA OF SCIENCE AND TECNOLOGY (INDEX). MCGRAW HILL BOOK CO, 1982.