Wendy Pfeffer. (2003). Wiggling Worms at Work (Let's-Read-and-Find-Out Science 2) (1.). HarperCollins.
Chicago-čujuhus (17. p.)Wendy Pfeffer. Wiggling Worms at Work (Let's-Read-and-Find-Out Science 2). 1. HarperCollins, 2003.
MLA-čujuhus (9. p.)Wendy Pfeffer. Wiggling Worms at Work (Let's-Read-and-Find-Out Science 2). 1. HarperCollins, 2003.
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