Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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