Ajmal, M. (1963). Our knowledge of the external world. Pakistan Philosophical Congress Publication.
Citazione stile Chigago Style (17a edizione)Ajmal, Muhammad. "Our Knowledge of the External World." Pakistan Philosophical Congress Publication 1963.
Citatione MLA (8a ed.)Ajmal, Muhammad. "Our Knowledge of the External World." Pakistan Philosophical Congress Publication, 1963.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.