Παραπομπή σε μορφή APA (7η εκδ.)

GRAY, A. S. The development of economic doctrine#An introductory survey#Alexander Gray. Longanns Northumberland Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

GRAY, Alexander Sir. The Development of Economic Doctrine#An Introductory Survey#Alexander Gray. Longanns Northumberland Press.

Παραπομπή σε μορφή MLA (8th εκδ.)

GRAY, Alexander Sir. The Development of Economic Doctrine#An Introductory Survey#Alexander Gray. Longanns Northumberland Press.