If you are a Chrysanthemum enthusiast, why not join the National Chrysanthemum Society? The aim of the Society is to: 'Promote the cultivation of Chrysanthemums and to encourage this to the highest standard'. Their website, link below, has a wealth of useful information, including an online shop where you can buy various books. As a good general introduction to cultivation and exhibiting we recommend the Society's 'Chrysanthemum Guide'.
There are various membership options, all at very reasonable prices. Membership includes three publications per year, free entry to the Society's two national shows and regional group shows. Membership and the book mentioned above, plus other publications, can be purchased via the website https://chrysanthemum-ncs.org/