Dyfyniad APA

Robinson, O. P., Blacker, W. R., & Logan, W. B. (1966). Salesmanship. Prentice-Hall.

Dyfyniad Arddull Chicago

Robinson, O. Preston, William R. Blacker, and William B. Logan. Salesmanship. Englewood Cliffs, New Jersey: Prentice-Hall, 1966.

Dyfyniad MLA

Robinson, O. Preston, et al. Salesmanship. Prentice-Hall, 1966.

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