APA-čujuhus (7. p.)
Friedrich, P. (1970). Proto-indo-european trees: The arboreal system of a prehistoric people. University of Chicago Press.
Chicago-čujuhus (17. p.)
Friedrich, Paul. Proto-indo-european Trees: The Arboreal System of a Prehistoric People. Chicago: University of Chicago Press, 1970.
MLA-čujuhus (9. p.)
Friedrich, Paul. Proto-indo-european Trees: The Arboreal System of a Prehistoric People. University of Chicago Press, 1970.
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