https://www.amazon.com/dp/1999686128/ref=cm_sw_em_r_mt_dp_TMB94DMKK0FF8CX1Y0PM
The course book goes with the classes offered on the learnwelsh.cymru website. There are free online courses if you register and they also follow the structure of the book.
Looks similar but this is the one I'm using on the Learn Welsh entry course!