Tsokos, K. A. (First edition 1998, Fourth edition 2005). Physics for the IB Diploma (fourth edition)(en inglés). Cambridge University Press. pp. 3, 109. ISBN978-052160405-5. «Power is the rate at which work is being performed. When a quantity of work ΔW is performed within a time interval Δt the ratio P = ΔW/Δt is called the power developed. Its unit is joules per second and this is given the name watt (W): 1 W = 1 J/s».
google.com.mx
books.google.com.mx
Halliday, David; Resnick, Robert; Walker, Jearl (13 de agosto de 2013). 6. Power. «Fundamentals of Physics» [Fundamentos de Física]. books.google(en inglés estadounidense) (10.ª edición) (John Wiley & Sons). ISBN9781118230718.
