ENDLER, O. (1972). Valuation theory. Springer verlag.
Cita Chicago (17th ed.)ENDLER, Otto. Valuation Theory. Berlin: Springer verlag, 1972.
Cita MLA (9th ed.)ENDLER, Otto. Valuation Theory. Springer verlag, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.