Gray, A. (1967). Development of economic doctrine: Introductory survey. Longman.
Chicago-čujuhus (17. p.)Gray, Alexander. Development of Economic Doctrine: Introductory Survey. London: Longman, 1967.
MLA-čujuhus (9. p.)Gray, Alexander. Development of Economic Doctrine: Introductory Survey. Longman, 1967.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.