WALKER, Timothy. Pollination : the enduring relationship between plant and pollinator. Princeton ; Oxford : Princeton Universitty Press, [2020]. ©2020. 1 online zdroj (224 stran). Dostupné na internetu: <https://ebookcentral.proquest.com/lib/ujep-ebooks/detail.action?docID=6296229> ISBN 978-0-691-20375-1.