APA (7th ed.) Citation

Jenkins, S. (2012). Tumblr For Dummies Portable Edition (1st edition.). For Dummies.

Chicago Style (17th ed.) Citation

Jenkins, Sue. Tumblr For Dummies Portable Edition. 1st edition. For Dummies, 2012.

MLA (9th ed.) Citation

Jenkins, Sue. Tumblr For Dummies Portable Edition. 1st edition. For Dummies, 2012.

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