Citazione Stile APA (7a Edizione)

Ryding, E., & Wentz, M. (1965). The concept "cause" as used in historical explanation: Two studies. CWK Gleerup.

Citazione stile Chigago Style (17a edizione)

Ryding, Erik, e Mary Wentz. The Concept "Cause" as Used in Historical Explanation: Two Studies. Lund: CWK Gleerup, 1965.

Citatione MLA (9a ed.)

Ryding, Erik, e Mary Wentz. The Concept "Cause" as Used in Historical Explanation: Two Studies. CWK Gleerup, 1965.