When working with Author(s) Names in the IEEE Style use only the initials of the first and middle names then the last name of the Author(s).
Give the names of all of the Author(s) unless there are six or more, in that case you can use the name of the first author followed by the Latin phrase et al.
For example, if you had a book written by 6 authors, Ross Tyner, Gilbert Bede, Marc Arellano, John Smith, Eva Engman, and Michelle Ward, the author information in the Reference List would be:
R. Tyner, et al.
If the book was written by Marc Arellano and Gilbert Bede, the author information in the Reference List would be:
M. Arellano and G. Bede.