Bigfoot: True or Real? is a book written by Dr. Sydney Van Gurben about the legendary Bigfoot.

In iBelieve in Bigfoot episode, Dr. Van Gurben appeared on iCarly to promote his book, and later on, he went out to Mount Baker National Forest supposedly to investigate reported sightings of Bigfoot (which the iCarly gang did, also).

It was ultimately revealed that the Bigfoot sighting was actually Dr. Van Gurben in a costume, trying to generate hype for his book. Dr. Van Gurben enjoys showing off his book, even when it absolutely unnecessary. This caused Sam to hit the book from his in annoyance.