* Barksdale, Jelks (1968). «Titanium». En Hampel, Clifford A., ed. The Encyclopedia of the Chemical Elements (Nueva York: Reinhold Book Corporation): 732-738. LCCN 68029938 | * Barksdale, Jelks (1968). «Titanium». En Hampel, Clifford A., ed. The Encyclopedia of the Chemical Elements (Nueva York: Reinhold Book Corporation): 732-738. LCCN 68029938 |