Watkinson, E. J., & Wall, A. E. (1982). PREP: The PREP play program, play skill instruction for mentally handicapped children. Canadian Association for Health, Physical Education and Recreation.
Citace podle Chicago (17th ed.)Watkinson, E. J., a A. E. Wall. PREP: The PREP Play Program, Play Skill Instruction for Mentally Handicapped Children. Ottawa, Ontario: Canadian Association for Health, Physical Education and Recreation, 1982.
Citace podle MLA (8th ed.)Watkinson, E. J., a A. E. Wall. PREP: The PREP Play Program, Play Skill Instruction for Mentally Handicapped Children. Canadian Association for Health, Physical Education and Recreation, 1982.
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