APA

Gray P. B., Brogdon E., . (20170310). Do Step- and Biological Grandparents Show Differences in Investment and Emotional Closeness With Their Grandchildren?. : Evolutionary psychology : an international journal of evolutionary approaches to psychology and behavior.

Chicago

Gray Peter B, Brogdon Elizabeth, . 20170310. Do Step- and Biological Grandparents Show Differences in Investment and Emotional Closeness With Their Grandchildren?. : Evolutionary psychology : an international journal of evolutionary approaches to psychology and behavior.

Harvard

Gray P. B., Brogdon E., . (20170310). Do Step- and Biological Grandparents Show Differences in Investment and Emotional Closeness With Their Grandchildren?. : Evolutionary psychology : an international journal of evolutionary approaches to psychology and behavior.

MLA

Gray Peter B, Brogdon Elizabeth, . Do Step- and Biological Grandparents Show Differences in Investment and Emotional Closeness With Their Grandchildren?. : Evolutionary psychology : an international journal of evolutionary approaches to psychology and behavior. 20170310.