Who Is Sylvia?

From Author Wars - https://authorwars.com/books/who-is-sylvia-94525.html

Overview:

Title: Who Is Sylvia?
Author: Chelsea Quinn Yarbro Thomas N. Scortia
Year: 1974
Type: Short Fiction

Variant Titles:

1979. Chi E' Silvia, Che Cos'e'?

Editions/Publications:

Unknown. Vampires, Werewolves and Other Monsters (Unknown, Chelsea Quinn Yarbro, Curtis Books, $0.95, 205 pages, Paperback, Anthology)
Unknown. Vampires, Werewolves and Other Monsters (Unknown, Thomas N. Scortia, Curtis Books, $0.95, 205 pages, Paperback, Anthology)