D H Trump (David Trump) is the main published book author at the moment and he mentions and investigates the Maltese Cart Ruts in a few books.
A couple of these are mainly about the megalith structures found on the islands of Malta and Gozo – known as Malta’s Temples. The Cart Ruts are a small section in them.
But these books are excellent if you are interested in the history of Malta and all its ancient puzzles and mysteries.
Cart Ruts and their impact on the Maltese landscape by D Trump
It is expensive but if you are interested in reading a very detailed investigation into Malta’s Cart Ruts then what choice do you have? Apart from looking at them on this site.
You can read a rare but short interview with David Trump about some of his ideas and how things have changed over the 50 years he has been investigating the Maltese grooves.
Malta: Prehistory and Temples by David Trump
This has a section dedicated to the ancient Maltese Cart Tracks and that starts at page 280.
Malta: an archaeological guide by D H Trump
This D Trump book looks at Malta’s Cart Tracks starting at page 24.
Cheaper David Trump books about Malta’s Cart Ruts?
Amazon seems expensive for D Trumps books but you can get them direct from Malta. They are much cheaper to initially buy but then you will have to add on international shipping costs. It seems you can only buy his books using a Credit Card but that may change. You may be able to get these books on the history of Malta for just over half the price, depending on where you live.