APA
, . (1972). REALM OF SCIENCE.21V. V20-Directions & dimensions of life:ecology man & nature. London: Touchstone Publishing Co.
Chicago
, . 1972. REALM OF SCIENCE.21V. V20-Directions & dimensions of life:ecology man & nature. London: Touchstone Publishing Co.
Harvard
, . (1972). REALM OF SCIENCE.21V. V20-Directions & dimensions of life:ecology man & nature. London: Touchstone Publishing Co.
MLA
, . REALM OF SCIENCE.21V. V20-Directions & dimensions of life:ecology man & nature. London: Touchstone Publishing Co. 1972.