APA-čujuhus (7. p.)

Patricia Lauber. (1994). "Be a Friend to Trees (Let's-Read-and-Find-Out, Stage 2)" (Revised.). HarperCollins.

Chicago-čujuhus (17. p.)

Patricia Lauber. "Be a Friend to Trees (Let's-Read-and-Find-Out, Stage 2)". Revised. HarperCollins, 1994.

MLA-čujuhus (9. p.)

Patricia Lauber. "Be a Friend to Trees (Let's-Read-and-Find-Out, Stage 2)". Revised. HarperCollins, 1994.

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