Bibliography
Books:
Kibbey, Heather and Long, Cheryl. How to Make a World of Liqueurs. Culinary Arts, Ltd., Portland Oregon, 1986.
Fairly detailed directions and recipes, but relies mostly on use of purchased extracts.
Meilach, Dona and Mel. Homemade Liqueurs. Comtemporary Books, Inc., Chicago, 1979.
Clear directions from unprocessed ingredients.