I absolutely adore the works of John Bird: https://www.google.com/search?tbo=p&tbm=bks&q=inauthor:%22John+Bird%22 https://www.google.com/search?tbo=p&tbm=bks&q=

I absolutely adore the works of John Bird: https://www.google.com/search?tbo=p&tbm=bks&q=inauthor:%22John+Bird%22 https://www.google.com/search?tbo=p&tbm=bks&q=inauthor:%22Jo... it really takes you from the ground up all the way to advanced subjects. He published multiple books on various levels of mathematics.