Gupta, C. K., & Suri, A. K. (1994). Extractive metallurgy of niobium. CRC Press.
Cita Chicago (17th ed.)Gupta, C. K., i A. K. Suri. Extractive Metallurgy of Niobium. Boca Raton: CRC Press, 1994.
Cita MLA (9th ed.)Gupta, C. K., i A. K. Suri. Extractive Metallurgy of Niobium. CRC Press, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.