Citazione Stile APA (7a Edizione)

Allen, C. F. 1., & Allen, C. f. 1. (1959). Railroad curves and earthwork (7th ed.). McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Allen, Calvin Francis 1851, e Calvin francis 1851 Allen. Railroad Curves and Earthwork. 7th ed. New York: McGraw-Hill, 1959.

Citatione MLA (9a ed.)

Allen, Calvin Francis 1851, e Calvin francis 1851 Allen. Railroad Curves and Earthwork. 7th ed. McGraw-Hill, 1959.