Open University. Graphs, networks and design. Planarity and colouring. Open University Press.
Chicago Style (17th ed.) CitationOpen University. Graphs, Networks and Design. Planarity and Colouring. Milton Keynes: Open University Press.
MLA (8th ed.) CitationOpen University. Graphs, Networks and Design. Planarity and Colouring. Open University Press.
Warning: These citations may not always be 100% accurate.