The following are useful reference books:
"Butterfly Gardening--Creating Summer Magic in Your Garden" by the Xerxes Society/Smithsonian Institution; $18.95, includes 100 color photographs, available mail order through Smith & Hawken, Mill Valley, Calif.
"The Butterflies of Greater Los Angeles" by Rudy Mattoni; an $8.00 field guide, available at Theodore Payne Foundation. (818) 768-1802.
"How to Attract Birds" by Ortho Books: $7.95.
Two local societies offer additional information: The Audubon Society, Plummer Park, Los Angeles; and the Lorquin Entomological Society at the Los Angeles County Museum of Natural History.