APA সাইটেশন

Crowther, J. G. (1966). Discoveries and inventions of the 20th century. London: Routledge & K. Paul.

শিকাগো স্টাইলে সাইটেশন

Crowther, J. G. Discoveries and Inventions of the 20th Century. London: Routledge & K. Paul, 1966.

এমএলএ সাইটেশন

Crowther, J. G. Discoveries and Inventions of the 20th Century. London: Routledge & K. Paul, 1966.