What is an entry in The Greenwood Encyclopedia of Folktales and Fairy Tales by Donald Haase that could be useful in a "Cinderella" research paper? How would I create a works cited page that includes the entry and write an annotated bibliography for the entry?

An entry that could be useful in a research paper on "Cinderella" is the entry on "Baba Yaga" on page 93 of The Greenwood Encyclopedia of Folktales and Fairy Tales. "Baba Yaga" is the archetypal Slavic witch who can be either good or evil, and she is the type on which witches, such as Cinderella's evil stepmother, might be based. To cite this entry in MLA format, you would use the following format:

Last, First M., and First M. Last. "Article Title." Encyclopedia Name. City: Publisher, Year Published. Page(s). Print. (see the source from Easy Bib below; all lines after the first line should be indented).

Therefore, the citation for this article would be as follows:

Pilinovsky, Helen. "Baba Yaga." The Greenwood Encyclopedia of Folktales and Fairy Tales. Ed. Donald Haase. Vol. 1. Westport, CT: Greenwood Press, 2007. 93-94. Print.

(All lines after the first line should be indented.)
An annotated bibliography can serve different purposes, including evaluating or summarizing a source or explaining why a source is relevant to a research project (see the source from Purdue OWL below for more about annotated bibliographies). Following the citation of the source, you might have three paragraphs. The first would summarize the source, the second would evaluate the source, and the third would explain the relevance to your project.
For example, for the entry on "Baba Yaga," you might include something along the following lines:

This entry explains the origins of the "Baba Yaga," a witch character in Slavic folktales. The entry goes on to explain Baba Yaga's salient characteristics, including her role as the aunt of all witches and her connection to other witches in literature, such as Hecate. The author explains Baba Yaga's connection to dragons and death and her physical characteristics. The author traces Baba Yaga's appearance in Slavic literature and the different translations of her name.

This source is a thorough explanation of the long existence of Baba Yaga in Slavic literature. The author examines the different sides and qualities of Baba Yaga and notes that she has both positive and negative qualities and can be either a friend or foe. In addition, the author cites scholars and compares this folkloric character to other characters in folklore.
In the final paragraph, you should explain the relevance of this entry to your project. How does reading about a witch in Slavic folklore help you explore and understand more about the history of witches in literature and about the stepmother figure in "Cinderella"? In this paragraph, you should explain why reading this entry expands your knowledge of "Cinderella."
http://www.easybib.com/reference/guide/mla/encyclopedia

https://owl.purdue.edu/owl/general_writing/common_writing_assignments/annotated_bibliographies/annotated_bibliography_samples.html