Cita APA (7a ed.)

Samuelson, P. (1973). Economics (9th.). McGraw Hill.

Cita Chicago Style (17a ed.)

Samuelson, Paul. Economics. 9th. NULL: McGraw Hill, 1973.

Cita MLA (9a ed.)

Samuelson, Paul. Economics. 9th. McGraw Hill, 1973.