APA
Gelder E. &. R. K., . (1991). Transistor -21. New Delhi: Wiley Eastern Limited.
Chicago
Gelder Erich & Reiter Karl-Heinz, . 1991. Transistor -21. New Delhi: Wiley Eastern Limited.
Harvard
Gelder E. &. R. K., . (1991). Transistor -21. New Delhi: Wiley Eastern Limited.
MLA
Gelder Erich & Reiter Karl-Heinz, . Transistor -21. New Delhi: Wiley Eastern Limited. 1991.