L.Ostlund Karen, & D. PH. (2008). Scott Foresman Science: Grade K. Volume 2. USA: Pearson Education, Inc.
Chicago Style aipamenaL.Ostlund Karen, và D. PH. Scott Foresman Science: Grade K. Volume 2. USA: Pearson Education, Inc, 2008.
MLA aipamenaL.Ostlund Karen, và D. PH. Scott Foresman Science: Grade K. Volume 2. USA: Pearson Education, Inc, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.