APA (7th ed.) Citation

Hahn, M. D. (1987). Wait till Helen comes: A ghost story. Avon Camelot Books.

Chicago Style (17th ed.) Citation

Hahn, Mary Downing. Wait Till Helen Comes: A Ghost Story. New York: Avon Camelot Books, 1987.

MLA (9th ed.) Citation

Hahn, Mary Downing. Wait Till Helen Comes: A Ghost Story. Avon Camelot Books, 1987.

Warning: These citations may not always be 100% accurate.