APA引文

Scheel, R. L. (1987). Introduction to the future. ETC Publications.

Chicago Style (17th ed.) Citation

Scheel, Randall L. Introduction to the Future. Palm Springs, Calif.: ETC Publications, 1987.

MLA引文

Scheel, Randall L. Introduction to the Future. ETC Publications, 1987.

警告：這些引文格式不一定是100％准確.