Cita APA

Buckley, E. A. (1961). How to increase sales with letters. McGraw Hill.

Chicago Edition Citation

Buckley, Earle A. How to Increase Sales with Letters. McGraw Hill, 1961.

Cita MLA

Buckley, Earle A. How to Increase Sales with Letters. McGraw Hill, 1961.

Atenció: Aquestes cites poden no estar 100% correctes.