Perrin, Richard. : Real world project management : beyond conventional wisdom, best practices, and project methodologies / Richard Perrin. [O'Reilly electronic resource]
Perrins, Christopher M., / author. : The backyard birdwatcher's bible : the history of birds, practical birdwatching & identification, understanding & attracting birds, bird-friendly gardens & bird-inspired art / written by Christopher Perrins, Sonya Patel Ellis, Paul Sterry, and Dominic Couzens.
Perro, Michelle, / author. : What's making our children sick? : how industrial food is causing an epidemic of chronic illness, and what parents (and doctors) can do about it [Hoopla electronic resource] / Michelle Perro, MD, and Vincanne Adams, PhD.
