APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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