Dyfyniad APA

Viro, O. (2008). Elementary topology: Problem textbook. American Mathematical Society.

Dyfyniad Arddull Chicago

Viro, O.Ya. Elementary Topology: Problem Textbook. Providence, R.I.: American Mathematical Society, 2008.

Dyfyniad MLA

Viro, O.Ya. Elementary Topology: Problem Textbook. American Mathematical Society, 2008.

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