pb?Paperback. Typically 7" by 4.25" (18 cm by 11 cm) or smaller, though trimming errors can cause them to sometimes be slightly (less than 1/4 extra inch) taller or wider/deeper.
Page count from WorldCat (OCLC, below); last numbered page (About the Author) is 319.
Publisher/imprint from library record OCLC 6718388 as "New York : Fawcett Crest, 1979, 1980." WorldCat records of "all editions and formats" make clear that that is a format error, as 1979 is the copyright year.