Read the following works cited entry.

redden, erica. galaxies and star dust.
boston: javelin press,

the date of publication for this title was for april 23, 1998. what is the correct format of the date to complete the entry?

(april 1998).
april 23, 1998.
april 1998.
1998.

The correct way to write the date of publication for this title and the date April 23, 1998 is 1998, because only the year is necessary. 
i.e Last name(s), initial(s) of the author(s). Year of publication. Article title. Journal title. Article number.

Your answer is: 1998 

Have an amazing day!

The correct answer is D.  The apostrophes has two uses: indicate the ommision of letters and numbers and the other use is to show possesion.

For example, My mother's car is red.