Stevens, G. C., & Matthew, K. K. (1989). Quercus costaricensis Liebm. and the problem of multi-seeded acorns.
Chicago Style aipamenaStevens, George C., y Kathryn K. Matthew. Quercus Costaricensis Liebm. and the Problem of Multi-seeded Acorns. 1989.
MLA aipamenaStevens, George C., y Kathryn K. Matthew. Quercus Costaricensis Liebm. and the Problem of Multi-seeded Acorns. 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.