APA

Sumathipala A., Siribaddana S. H., Abeysingha N. M. R., De Silva N., Fernando D. J. S., Dayaratne D. A. R. K., De Silva D., Warnasuriya N. D. & Hotopf M. (20030527). Challenges in recruiting older twins for the Sri Lankan twin registry. : Twin research : the official journal of the International Society for Twin Studies.

Chicago

Sumathipala Athula, Siribaddana Sisira H, Abeysingha Nihal M R, De Silva Nimali, Fernando Devaka J S, Dayaratne D A R K, De Silva Deepthi, Warnasuriya Narada D and Hotopf Mathew. 20030527. Challenges in recruiting older twins for the Sri Lankan twin registry. : Twin research : the official journal of the International Society for Twin Studies.

Harvard

Sumathipala A., Siribaddana S. H., Abeysingha N. M. R., De Silva N., Fernando D. J. S., Dayaratne D. A. R. K., De Silva D., Warnasuriya N. D. and Hotopf M. (20030527). Challenges in recruiting older twins for the Sri Lankan twin registry. : Twin research : the official journal of the International Society for Twin Studies.

MLA

Sumathipala Athula, Siribaddana Sisira H, Abeysingha Nihal M R, De Silva Nimali, Fernando Devaka J S, Dayaratne D A R K, De Silva Deepthi, Warnasuriya Narada D and Hotopf Mathew. Challenges in recruiting older twins for the Sri Lankan twin registry. : Twin research : the official journal of the International Society for Twin Studies. 20030527.