Ang maunlad na pagtitinda
| Auteur principal: | |
|---|---|
| Format: | Livre | 
| Langue: | Filipino | 
| Publié: | [Manila]
          Philippine Journal of Education
    
        1954. | 
| Sujets: | 
| Auteur principal: | |
|---|---|
| Format: | Livre | 
| Langue: | Filipino | 
| Publié: | [Manila]
          Philippine Journal of Education
    
        1954. | 
| Sujets: |