Cartoon: "Martha! We've been invaded!"

From Author Wars - https://authorwars.com/books/cartoon-martha-weve-been-invaded-928404.html

Overview:

Title: Cartoon: "Martha! We've been invaded!"
Author: William Rotsler
Year: 1974
Type: Interior Art

Editions/Publications:

Unknown. Vertex: The Magazine of Science Fiction, December 1974 (Unknown, William Rotsler, Mankind Publishing Company, $1.50, 100 pages, quarto, MAGAZINE)