Speck, T., & Burgert, I. Plant stems: Functional design and mechanics.
Chicago Style aipamenaSpeck, Thomas., và Ingo Burgert. Plant Stems: Functional Design and Mechanics.
MLA aipamenaSpeck, Thomas., và Ingo Burgert. Plant Stems: Functional Design and Mechanics.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.