APA Citation

Houghton Mifflin Company. (2009). [Triangle fact cards]. [Boston]: Houghton Mifflin.

Chicago Style Citation

Houghton Mifflin Company. [Triangle Fact Cards]. [Boston]: Houghton Mifflin, 2009.

MLA Citation

Houghton Mifflin Company. [Triangle Fact Cards]. [Boston]: Houghton Mifflin, 2009.

Warning: These citations may not always be 100% accurate.