International Young Naturefriends (IYNF). Variety of the Rainbow: Magazine of the International Young Naturefriends. Brussel: International Young Naturefriends.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Young Naturefriends (IYNF). Variety of the Rainbow: Magazine of the International Young Naturefriends. Brussel: International Young Naturefriends.
Παραπομπή σε μορφή MLA (8th εκδ.)International Young Naturefriends (IYNF). Variety of the Rainbow: Magazine of the International Young Naturefriends. Brussel: International Young Naturefriends.
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