APA-čujuhus (7. p.)
Sawyer, W. W. (1955). Prelude to Mathematics (1a. ed.). Pelican books.
Chicago-čujuhus (17. p.)
Sawyer, W. W. Prelude to Mathematics. 1a. ed. Londres: Pelican books, 1955.
MLA-čujuhus (9. p.)
Sawyer, W. W. Prelude to Mathematics. 1a. ed. Pelican books, 1955.
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