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.
芝加哥风格引文Gregory, Jill, 与 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引文Gregory, Jill, 与 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.
警告：这些引文格式不一定是100％准确.