De Brigard, R., & Helmer, O. (1970). Some potential developments, 1970-2000. Institute for the Future.
芝加哥风格引文De Brigard, Raul, 与 Olaf Helmer. Some Potential Developments, 1970-2000. Middletown, Conn.: Institute for the Future, 1970.
MLA引文De Brigard, Raul, 与 Olaf Helmer. Some Potential Developments, 1970-2000. Institute for the Future, 1970.
警告：这些引文格式不一定是100％准确.