Wilson Susan <br/><br/>
Introducton to logic    Part 1 to 9.1V. 

 - London  The Open University Press      1971 
<br/><br/><label>Standard No.: </label>129818 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>R1, L.1-.2