Vriesenga, D. Trees and plants: Grades 1-2. Instructional fair.
Čikaški stil citiranja (17. izdanje)Vriesenga, Daryl. Trees and Plants: Grades 1-2. Michigan: Instructional fair.
MLA način citiranja (9. izdanje)Vriesenga, Daryl. Trees and Plants: Grades 1-2. Instructional fair.
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