Παραπομπή σε μορφή APA (7η εκδ.)

Shapiro, A. C., & Harman, P. M. (1992). The investigation of difficult things: Essays on Newton and the history of the exact science. Cambridge University press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Shapiro, Alan C., και P. M. Harman. The Investigation of Difficult Things: Essays on Newton and the History of the Exact Science. Cambridge: Cambridge University press, 1992.

Παραπομπή σε μορφή MLA (8th εκδ.)

Shapiro, Alan C., και P. M. Harman. The Investigation of Difficult Things: Essays on Newton and the History of the Exact Science. Cambridge University press, 1992.