Navigating back after following link in iBooks

I was reading a book in iBooks and clicked on a link in the text which took me to the index at the end of the book. Is there any way I can get back to where I was reading before I tapped on the link (without manually flipping through the pages/table of contents)? There's no obvious back button that I can see.

I'm using iBooks 1.5, which I believe is currently the latest version.

If you touch the middle of the screen to show the buttons and controls, there should be a text link at the bottom left saying "Back to p. ###". It is beneath the dots and the slider to scroll quickly through the book. Touch it and you'll be back where you came from.