given volume is the algebraic sum of all the pressures exerted by each gas if it were alone in that volume. References Electronic Devices and Circuit Theory (9th ed.) by Boylestad and Nashelsky Basic Circuit Theory by C. A. Desoer and E. H. Kuh ''Edward Hughes revised by John.K, Keith.B etal (2008) Electrical and Electronic Technology (10th ed.) Pearson page 75-77 External links On the Application of Superposition to Dependent Sources in Circuit Analysis – proves superposition of dependent sources is valid. Circuit theorems de:Superposition (Physik)#Elektrotechnik