Happ, H. H. (1980). Piecewise methods and applications to power systems. John Wiley.
Citazione stile Chigago Style (17a edizione)Happ, H. H. Piecewise Methods and Applications to Power Systems. Nueva York: John Wiley, 1980.
Citatione MLA (9a ed.)Happ, H. H. Piecewise Methods and Applications to Power Systems. John Wiley, 1980.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.