Dyfyniad APA

D'Estang, V. G. (1990). The Book of inventions and discoveries. Macdonald.

Dyfyniad Arddull Chicago

D'Estang, Valerie-Ann Giscard. The Book of Inventions and Discoveries. London: Macdonald, 1990.

Dyfyniad MLA

D'Estang, Valerie-Ann Giscard. The Book of Inventions and Discoveries. Macdonald, 1990.

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