Article on Prof. Matthews being appointed the representative of Botswana at the headquarters of the United Nations. With an overview of his life's achievements. Published in S.A. Outlook, August 1966, p. 123.
Mrs. A. K. Lubogo writes to Mrs. Frieda Matthews to express sympathy on the loss of her husband, Prof. Z. K. Matthews. Letter sent care of Lady Ruth Khama. Dated 16 May 1968.