Colombo, U., & Turani, G. (1986). Der zweite Planet. Information series / Club of Rome.
芝加哥风格引文Colombo, Umberto, 与 Giuseppe Turani. "Der Zweite Planet." Information Series / Club of Rome 1986.
MLA引文Colombo, Umberto, 与 Giuseppe Turani. "Der Zweite Planet." Information Series / Club of Rome, 1986.
警告:这些引文格式不一定是100%准确.