Ngā kupu hautoa kōpae

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