Dyfyniad APA

Gibson, C. R. (1913). 20th century inventions. Collins' Clear Type Press.

Dyfyniad Arddull Chicago

Gibson, Charles R. 20th Century Inventions. London: Collins' Clear Type Press, 1913.

Dyfyniad MLA

Gibson, Charles R. 20th Century Inventions. Collins' Clear Type Press, 1913.

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