APA-čujuhus (7. p.)
(1969). The Colorado river region and John Wessley Powel. U.S. Govt. Print. Off..
Chicago-čujuhus (17. p.)
The Colorado River Region and John Wessley Powel. Washington: U.S. Govt. Print. Off., 1969.
MLA-čujuhus (9. p.)
The Colorado River Region and John Wessley Powel. U.S. Govt. Print. Off., 1969.
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