Kunz, Richard R. Twin Wires: First U.S. Trolley Buses. Bus World (Sunrise Enterprises). Spring 1986, 8 (3): 26–29. ISSN 0162-9689.参数|magazine=与模板{{cite journal}}不匹配(建议改用{{cite magazine}}或|journal=) (帮助)
Haseldine, Peter (March–April 2015). "Tehran Closure". Trolleybus Magazine No. 320, pp. 40–43. National Trolleybus Association (UK). ISSN0266-7452.