APA استشهاد

Doyle, A. C. (1994). The Sign of the Four (1st.). OUP.

استشهاد بنمط شيكاغو

Doyle, Arthur Conan. The Sign of the Four. 1st. New York: OUP, 1994.

MLA استشهاد

Doyle, Arthur Conan. The Sign of the Four. 1st. OUP, 1994.