Littlefield, D. (2008). Metric handbook: Planning and design data (3rd ed.). Elsevier.
Chicago Style aipamenaLittlefield, David. Metric Handbook: Planning and Design Data. 3rd ed. Amsterdam: Elsevier, 2008.
MLA aipamenaLittlefield, David. Metric Handbook: Planning and Design Data. 3rd ed. Elsevier, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.