Collector's Items; The U.S. postal sevice now aggressively stamps as keepsakes.

MLA

Collector's Items; The U.s. Postal Sevice Now Aggressively Stamps As Keepsakes. .

APA

Collector's Items; The U.S. postal sevice now aggressively stamps as keepsakes. .

Chicago

Collector's Items; The U.S. Postal Sevice Now Aggressively Stamps As Keepsakes.