Παραπομπή APA

Abdul Kalam A.P.J & Singh, S. P. Target 3 billion: PURA:innovative solutions towards sustainable development. Penguin books.

Παραπομπή Chicago Style

Abdul Kalam A.P.J και Srijan Pal Singh. Target 3 Billion: PURA:innovative Solutions Towards Sustainable Development. 2011: Penguin books.

Παραπομπή MLA

Abdul Kalam A.P.J και Srijan Pal Singh. Target 3 Billion: PURA:innovative Solutions Towards Sustainable Development. Penguin books.