APA-viite (7. p.)
Heady, E. O. (1956). Resource productivity, returns to scale, and farm size (ed.). The Iowa state college Press.
Chicago-viite (17. p.)
Heady, Earl O. Resource Productivity, Returns to Scale, and Farm Size. ed. Ames,Iowa: The Iowa state college Press, 1956.
MLA-viite (9. p.)
Heady, Earl O. Resource Productivity, Returns to Scale, and Farm Size. ed. The Iowa state college Press, 1956.
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