In 1938 the Simon J. Lubin Society published The Harvest Gypsies, with an added eighth chapter, in pamphlet form under the title, Their Blood is Strong. Please see our entry on The Harvest Gypsies.
Meyer, Michael J.. "Their Blood Is Strong". The Literary Encyclopedia. First published 10 January 2008; last revised 30 November -1.
[http://www.litencyc.com/php/sworks.php?rec=true&UID=23076, accessed 20 April 2015.]