Não informado. (1993). Technical Education & Training Abstracts. Carfax Publishing.
Citace podle Chicago (17th ed.)Não informado. Technical Education & Training Abstracts. Oxfordshire, Inglaterra: Carfax Publishing, 1993.
Citace podle MLA (8th ed.)Não informado. Technical Education & Training Abstracts. Carfax Publishing, 1993.
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