Cita APA (7a ed.)

Ferraro, R., & Sforza, D. M. (2000). Operator ordering for generally covariant systems.

Cita Chicago Style (17a ed.)

Ferraro, Rafael, y Daniel Marcelo Sforza. Operator Ordering for Generally Covariant Systems. 2000.

Cita MLA (8a ed.)

Ferraro, Rafael, y Daniel Marcelo Sforza. Operator Ordering for Generally Covariant Systems. 2000.