Here is what you need to cite or reference this book on the web.
The date included should be the date you read the text cited from the web.
If you want to cite a specific part of the text add a slash / and its subheading after the htm, and enter _  instead of the blanks, if any, in the subheading.

MLA Style:

Zetterberg, Hans L., The Many-Splendored Society. Book 4. All Realms are Born Equal. Unfinished manuscript. 2008-11-06. <http://www.zetterberg.org/InProgrs/The_Many-Splendored_Society/b_Realms.htm>.

APA Style:

Zetterberg, Hans L. The Many-Splendored Society. Book 4. All Realms are Born Equal. Unfinished manuscript. Retrieved 2008-11-06 from the World Wide Web: http://www.zetterberg.org/InProgrs/The_Many-Splendored_Society/b_Realms.htm

Turabian Style:

Zetterberg, Hans L. The Many-Splendored Society. Book 4. All Realms are Born Equal. [Online] available from http://www.zetterberg.org/InProgrs/The_Many-Splendored_Society/b_Realms.htm; accessed 2008-11-06; Internet.