APA (7th ed.) Citation

Feynman, R. P. (1989). " Nem sempre a brincar, sr. Feynman! ". Gradiva.

Chicago Style (17th ed.) Citation

Feynman, Richard P. " Nem Sempre a Brincar, Sr. Feynman! ". Gradiva, 1989.

MLA (8th ed.) Citation

Feynman, Richard P. " Nem Sempre a Brincar, Sr. Feynman! ". Gradiva, 1989.

Warning: These citations may not always be 100% accurate.