Though the name is spelled “Kammel” in some reference works it is always spelled “Kammell” on his publications, concert advertisements and personal documents from his time in England. I prefer to use “Kammell.”
On published scores his name is “Antonio Kammell”. In private life in England he was called “Anthony Kammell.”
There is a biography and a thematic catalogue of his music on this website.
Here is a pdf of the complete book with illustrations:
Here is a pdf of the thematic catalogue of his works:
Here are links to recordings of his music: