APA引文

(1999). Research maps (R-maps) HUD/PD&R policy and research data for use with GIS. [electronic resource].

Chicago Style (17th ed.) Citation

Research Maps (R-maps) HUD/PD&R Policy and Research Data for Use with GIS. [electronic Resource]. 1999.

MLA引文

Research Maps (R-maps) HUD/PD&R Policy and Research Data for Use with GIS. [electronic Resource]. 1999.

警告：這些引文格式不一定是100％准確.