Goss, p. 153.

Purfield, Wood Craft, 5: 181.

Park, pp. 129-135.

Griffith, pp. 75-78.

Wood Craft, 5: 103.

Wheeler, pp. 428-433.

Tacks.

Wheeler, pp. 429-433.

Sickels, p. 70.

Goss, p. 155.