The book of steps: the Syriac Liber Graduum /
translated,  with an introduction and notes by Robert A. Kitchen and Maartien F.G. Parmentier 
. - Kalamazoo : Cistercian Publications,  2004 
. - lxxxiii, 389 p.  21 cm. 
<br/>К.: Бібліогр. : с. 365-376, Покажчик 
<br/><label>  ISBN: </label>0-87907-696-8