MLA

Belva Ann Lockwood : First Day of Issue : June 18, 1986 ; First Issue Location : Middleport, New York. The Maximum Card Collection, 0AD. https://collections.library.yale.edu/catalog/33532322.

APA, 6th edition

Belva Ann Lockwood : first day of issue : June 18, 1986 ; first issue location : Middleport, New York. (0 C.E.). [Postcards]. The Maximum Card Collection. https://collections.library.yale.edu/catalog/33532322.