Dyfyniad APA

McGowan, R. M., Parkes, W. R., Phillips, T. J., & Williamson, R. G. (1974). Letter: Disability and coal workers' pneumoconiosis.

Dyfyniad Arddull Chicago

McGowan, R M., W R. Parkes, T J. Phillips, and R G. Williamson. Letter: Disability and Coal Workers' Pneumoconiosis. 1974.

Dyfyniad MLA

McGowan, R M., W R. Parkes, T J. Phillips, and R G. Williamson. Letter: Disability and Coal Workers' Pneumoconiosis. 1974.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.