Ronald, D., & Weston-Smith, M. (1977). The encyclopaedia of ignorance: Everything you ever wanted to know about the unknown. Pergamon Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)Ronald, Duncan, και Miranda Weston-Smith. The Encyclopaedia of Ignorance: Everything You Ever Wanted to Know About the Unknown. Oxford: Pergamon Press, 1977.
Παραπομπή σε μορφή MLA (8th εκδ.)Ronald, Duncan, και Miranda Weston-Smith. The Encyclopaedia of Ignorance: Everything You Ever Wanted to Know About the Unknown. Pergamon Press, 1977.
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