Baker AJM, Brooks RR (1989) Terrestrial higher plants which hyperaccumulate metallic elements - a review of their distribution, ecology and phytochemistry. Biorecovery 1:81–126

Put it in a proper reference format and in-text citation quotes using Apa Referencing Style

Baker, A.J.M., & Brooks, R.R. (1989). Terrestrial higher plants which hyperaccumulate metallic elements - a review of their distribution, ecology and phytochemistry. Biorecovery, 1, 81–126.

In-text citation: (Baker & Brooks, 1989)