Muhammad Irfan Perdana and Imre Kovacs are quite right that the art of dictionary-writing is (practical) lexicography.
If you are interested in reflections on past dictionaries, rather than how to write a new one, that is still lexicography. See the references in English lexicology and lexicography – Wikipedia: most of them fall under that category; and in fact any work on how to write a dictionary (practical lexicography) is going to reflect on how dictionaries have been written in the past.