APA (7e ed.) Bronvermelding

Sigdel, A., & Chaudhary, S. S. (1998). A study of the effectiveness of pulse polio immunization programme (PPIP) - 2053 B.S.

Chicago (17e ed.) Bronvermelding

Sigdel, Abindra, en Sanjay Srivastava Chaudhary. A Study of the Effectiveness of Pulse Polio Immunization Programme (PPIP) - 2053 B.S. 1998.

MLA (8e ed.) Bronvermelding

Sigdel, Abindra, en Sanjay Srivastava Chaudhary. A Study of the Effectiveness of Pulse Polio Immunization Programme (PPIP) - 2053 B.S. 1998.