Nault, W. H. (1976). The 1976 world book year book: A review of the events of 1975 : the annual supplement to thew world book encyclopedia. Chicago: Field Enterprises Educational Corporation.
Παραπομπή Chicago StyleNault, William H. The 1976 World Book Year Book: A Review of the Events of 1975 : The Annual Supplement to Thew World Book Encyclopedia. Chicago: Field Enterprises Educational Corporation, 1976.
Παραπομπή MLANault, William H. The 1976 World Book Year Book: A Review of the Events of 1975 : The Annual Supplement to Thew World Book Encyclopedia. Chicago: Field Enterprises Educational Corporation, 1976.
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