Cita APA (7th ed.)
Walther, H., & Nägler, G. (1987). Graphen, Algorithmen, Programme. Springer.
Cita Chicago (17th ed.)
Walther, Hansjoachim, i Günter Nägler. Graphen, Algorithmen, Programme. Wien, New York: Springer, 1987.
Cita MLA (9th ed.)
Walther, Hansjoachim, i Günter Nägler. Graphen, Algorithmen, Programme. Springer, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.