Cita APA (7th ed.)

Gaskell, P. (1972). A New introduction to bibliography. Clarendon Pr.

Cita Chicago (17th ed.)

Gaskell, Philip. A New Introduction to Bibliography. Oxford: Clarendon Pr, 1972.

Cita MLA (9th ed.)

Gaskell, Philip. A New Introduction to Bibliography. Clarendon Pr, 1972.