Shoff, Wilfred H. <br/><br/>
Periplaus  Ethriyan Kadaltheerathiloode oru Kappal yathra tr by P.K.Padmanabhan Nair / 

 - Thiruvananthapuram :  Kerala Bhasha Institute ,  1982. 
 - Pp  65.20.5cms 
 - Kerala Bhasha Institute Prasedheekaranam .