produced by Force Four Entertainment Inc. in association with Discovery Health Channel, LLC and Canadian Broadcasting Corporation ; produced by John Ritchie, Rob Bromley ; written and directed by John Ritchie ; associate producer, Sharon McNamara
a film by Saul Landau and Sonia Argulo ; produced by Saul Landau and George McAlmon ; written by Saul Landau ; a production of the College of Letters, Arts, and Social Sciences and Media Vision at California State Polytechnic University, Pomona
Chupacabra Productions, Güije Films, Cine Rhombifer ; a Saul Landau film ; written and directed by Saul Landau ; produced by Saul Landau, George McAlmon
Tecolote Films, Piano ; un documental de Eugenio Polgovsky ; dirección, fotografía, edición y diseño de sonido, Eugenio Polgovsky ; productores, Julio Chavezmontes, Eugenio Polgovsky