Gregory, J., & Thacker, R. (1987). Audiovisual resources in occupational health and safety: Films, videos and tape slides available from distributors in the United Kingdom. Health and Safety Executive.
Chicago-viite (17. p.)Gregory, Jill, ja Rosemary Thacker. Audiovisual Resources in Occupational Health and Safety: Films, Videos and Tape Slides Available from Distributors in the United Kingdom. Sheffield: Health and Safety Executive, 1987.
MLA-viite (9. p.)Gregory, Jill, ja Rosemary Thacker. Audiovisual Resources in Occupational Health and Safety: Films, Videos and Tape Slides Available from Distributors in the United Kingdom. Health and Safety Executive, 1987.
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