David James Press. (1987). Map & guide to Puerto Rico & the U.S. Virgin Islands (1988 Edition.). David James Press.
Chicago-Zitierstil (17. Ausg.)David James Press. Map & Guide to Puerto Rico & the U.S. Virgin Islands. 1988 Edition. New York: David James Press, 1987.
MLA-Zitierstil (8. Ausg.)David James Press. Map & Guide to Puerto Rico & the U.S. Virgin Islands. 1988 Edition. David James Press, 1987.
警告：這些引文格式不一定是100％准確.