Spencer, M. (1986). Contemporary economics (6th. ed.). Worth.
Chicago-čujuhus (17. p.)Spencer, Milton. Contemporary Economics. 6th. ed. New York: Worth, 1986.
MLA-čujuhus (9. p.)Spencer, Milton. Contemporary Economics. 6th. ed. Worth, 1986.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.