APA引文

Maps.com (Firm) & ebrary, Inc. (2001). Portland. Maps.com.

芝加哥风格引文

Maps.com (Firm) 与 Inc ebrary. Portland. [S.l.]: Maps.com, 2001.

MLA引文

Maps.com (Firm) 与 Inc ebrary. Portland. Maps.com, 2001.

警告：这些引文格式不一定是100％准确.