Orna, E. (1978). Thesaurus: Engineering Industry Training Board, Library and Information Services. Engineering Industry Training Board.
Chicago-viite (17. p.)Orna, Elizabeth. Thesaurus: Engineering Industry Training Board, Library and Information Services. Watford [Hertfordshire]: Engineering Industry Training Board, 1978.
MLA-viite (8. p.)Orna, Elizabeth. Thesaurus: Engineering Industry Training Board, Library and Information Services. Engineering Industry Training Board, 1978.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.