Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Douglas Adams:

"

Adams and Mark Carwardine contributed the 'Meeting a Gorilla' passage from Last Chance to See to the book The Great Ape Project.[2] This book, edited by Paola Cavalieri and Peter Singer, launched a wider-scale project in 1993, which calls for the extension of moral equality to include all great apes, human and non-human.[citation needed][3]