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.
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.