por Biggs, Alton [autor] | Hagins, Whitney Crispen [autor] | Holliday, William G [autor] | Kapicka, Chris [autor] | Lundgren, Linda [autor] | MacKenzie, Ann Haley [autor] | Rogers, William D [autor] | Sewer, Marion B [autor] | Zike, Dinah [autor].
por Phillips, John S [autor] | Strozak, Victor S [autor] | Wistrom, Cheryl [autor] | Zike, Dinah [autor] | Ramírez Medeles, Maria del Carmen [traductor] | Zugazagoitia Herranz, Rosa [traductor].