Sheppard, D., & Valentine, S. D. (1979). The provision of road safety instruction for the elderly. Transport and Road Research Laboratory.
Chicago-viite (17. p.)Sheppard, D., ja Shelagh D. Valentine. The Provision of Road Safety Instruction for the Elderly. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1979.
MLA-viite (9. p.)Sheppard, D., ja Shelagh D. Valentine. The Provision of Road Safety Instruction for the Elderly. Transport and Road Research Laboratory, 1979.
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