The research paper gathering library material, organizing and preparing the manuscript
| Prif Awdur: | |
|---|---|
| Awduron Eraill: | |
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
Englewood Cliffs, N.J.
Prentice-Hall
1962
|
| Rhifyn: | 3d ed. |
| Pynciau: |