APA

Higman D., . (1968). An ecologically annotated checklist of the vascular flora at the Chesapeake Bay Center for Field Biology, with keys. Washington, D.C: Office of Ecology, Smithsonian Institution.

Chicago

Higman Daniel, . 1968. An ecologically annotated checklist of the vascular flora at the Chesapeake Bay Center for Field Biology, with keys. Washington, D.C: Office of Ecology, Smithsonian Institution.

Harvard

Higman D., . (1968). An ecologically annotated checklist of the vascular flora at the Chesapeake Bay Center for Field Biology, with keys. Washington, D.C: Office of Ecology, Smithsonian Institution.

MLA

Higman Daniel, . An ecologically annotated checklist of the vascular flora at the Chesapeake Bay Center for Field Biology, with keys. Washington, D.C: Office of Ecology, Smithsonian Institution. 1968.