Author: Hodges, H. A.
Publisher:Kegan Paul, Trench, Trubner and Co. Ltd., London
Copyright:1944
Author: Stryk, Lucien
Publisher:Doubleday & Company, New York
Copyright:1968
Author: Rele, V. G.
Publisher:D B Taraporevala sons and co., Bombay
Copyright:1944
Author: Sivananda, Swami
Publisher:D B Taraporevala sons and co., Bombay
Copyright:1944