APA
(1971). Refrigeration and Air Conditioning Directory 1971. England: MACLAREN GROUP PUBLICATION.
Chicago
1971. Refrigeration and Air Conditioning Directory 1971. England: MACLAREN GROUP PUBLICATION.
Harvard
(1971). Refrigeration and Air Conditioning Directory 1971. England: MACLAREN GROUP PUBLICATION.
MLA
Refrigeration and Air Conditioning Directory 1971. England: MACLAREN GROUP PUBLICATION. 1971.