APA

webb j. e., . (1981). guide to invertebrate animals. londen: macmilan press.

Chicago

webb j e, . 1981. guide to invertebrate animals. londen: macmilan press.

Harvard

webb j. e., . (1981). guide to invertebrate animals. londen: macmilan press.

MLA

webb j e, . guide to invertebrate animals. londen: macmilan press. 1981.