Halpern, Kimberly BOO-BOO FINDS A HOME: A RAGS TO RICHES STORY

Halpern, Michèle The Wounded Turtle

Halpern, Gregory ZZYZX

Halpern, Richard Leibnizing: A Philosopher in Motion

Halpern, Senior Editor Rachel Los Unicornios Tienen Malos Modales (Unicorns Have Bad Manners)

Halpern, Paul Wielki wybuch: George Gamow, Fred Hoyle i debata o początkach Wszechświata