Gaya APA

Toft, B., Jensen, T, R. (1995). Graph coloring problems / Tommy R. Jensen, Bjarne Toft . New York: John Wiley n Sons.

Gaya MLA

Toft, Bjarne., Jensen, Tommy, R.. "Graph coloring problems / Tommy R. Jensen, Bjarne Toft". New York: John Wiley n Sons, 1995. Textbook.