Lua APA (7ú heag.)

Porteous, I. R. (1969). Topological geometry (1969). Van Nostrand Reinhold.

Lua i Stíl Chicago (17ú heag.)

Porteous, Ian Robertson. Topological Geometry (1969). London: Van Nostrand Reinhold, 1969.

Lua MLA (9ú heag.)

Porteous, Ian Robertson. Topological Geometry (1969). Van Nostrand Reinhold, 1969.

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