Gaya APA
, ., Gay, D. (2007).
Exploration in topoligy : map coloring surfaces and knots .
London:
London: Elsevier, 2007.
Gaya MLA
, ., Gay, David.
"Exploration in topoligy : map coloring surfaces and knots".
London:
London: Elsevier, 2007,
2007.
Text.