Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Warning: These citations may not always be 100% accurate.