Cita APA (7th ed.)
Kaspar, I. I., & Enyart, J. I. (2000). Concrete pipe for the new millennium. ASTM.
Cita Chicago (17th ed.)
Kaspar, Iraj I., i Jeffrey I. Enyart. Concrete Pipe for the New Millennium. West Conshohocken, PA: ASTM, 2000.
Cita MLA (9th ed.)
Kaspar, Iraj I., i Jeffrey I. Enyart. Concrete Pipe for the New Millennium. ASTM, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.