The Gardnerian Book of Shadows, by Gerald Gardner, at sacred-texts.com
It is said, "When a woman takes the main part in worship of the Male God, she must be girt with a sword." Note. This hath been explained as meaning that a man should be Magus representing the God, but if no one of sufficient rank and knowledge be present, a woman armed as a man may take his place. The sheath should be worn in a belt. She should carry the sword in hand, but if she has to use her hands, she should sheath the sword. Any other woman in the circle while this worship is performed shall be sword in hand. Those outside the circle only have the athame. A woman may impersonate either the God or the Goddess, but a man may only impersonate the God.