Credits and collections Richard P. Ettinger [and] David E. Holieb.
| Prif Awdur: | |
|---|---|
| Awduron Eraill: | |
| Fformat: | Llyfr | 
| Iaith: | English | 
| Cyhoeddwyd: | Englewood Cliffs, N. J.
          Prentice-Hall
    
        c1956 | 
| Rhifyn: | 4th ed. | 
| Pynciau: | 
| Prif Awdur: | |
|---|---|
| Awduron Eraill: | |
| Fformat: | Llyfr | 
| Iaith: | English | 
| Cyhoeddwyd: | Englewood Cliffs, N. J.
          Prentice-Hall
    
        c1956 | 
| Rhifyn: | 4th ed. | 
| Pynciau: |