Gaya APA
Whitehead, A, A, B. (1957).
Principia mathematica, (repr.of) 2d ed. Penerbitan asli 1910-1913. .
Cambridge:
University Press.
Gaya MLA
Whitehead, A.N.,, And, B.Russell..
"Principia mathematica, (repr.of) 2d ed. Penerbitan asli 1910-1913. ".
Cambridge:
University Press,
1957.
Buku.