Answer:

Rifkin, Jeremy. The Biotech Century: Harnessing the Gene & Remaking the World. New York: Tarcher/Putnam, 1998.

Commentary:

First of all, the entry must always start with the author's name (if the text has an author).

Second of all, because "The Biotech Century: Harnessing the Gene and Remaking the World" is the title of a book, it must be italicized or underlined.

Thirdly, publication information must be provided. That means, in this case, the place of publication, the publisher and the date of publication.