Graham, D. A. (1985). The William Cowpland (Copeland) family: Of Yorkshire, England and Chester, Pennsylvania ; with notes on the Samuel Nicholas family and Shute families of Philadelphia, Pennsylvania, and the Joseph Gray family of Philadelphia, Pennsylvania. [Baltimore, Md.].

Graham, Daniel A. The William Cowpland (Copeland) Family: Of Yorkshire, England and Chester, Pennsylvania ; With Notes On the Samuel Nicholas Family and Shute Families of Philadelphia, Pennsylvania, and the Joseph Gray Family of Philadelphia, Pennsylvania. [Baltimore, Md.], 1985.

Graham, Daniel A. The William Cowpland (Copeland) Family: Of Yorkshire, England and Chester, Pennsylvania ; With Notes On the Samuel Nicholas Family and Shute Families of Philadelphia, Pennsylvania, and the Joseph Gray Family of Philadelphia, Pennsylvania. [Baltimore, Md.], 1985.