Coleman 1995, p. 285 Coleman, Eliot (1995). The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener. A Gardener's Supply Book. Illustrated by Sheri Amsel. Foreword by Paul Hawken. Revised and expanded edition. (2nd ed.). Vermont, USA: Chelsea Green Publishing. ISBN978-0930031756. OCLC32822552.
Coleman 1995, pp. 199–203 Coleman, Eliot (1995). The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener. A Gardener's Supply Book. Illustrated by Sheri Amsel. Foreword by Paul Hawken. Revised and expanded edition. (2nd ed.). Vermont, USA: Chelsea Green Publishing. ISBN978-0930031756. OCLC32822552.
Coleman 1995, pp. 181–183, 278 Coleman, Eliot (1995). The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener. A Gardener's Supply Book. Illustrated by Sheri Amsel. Foreword by Paul Hawken. Revised and expanded edition. (2nd ed.). Vermont, USA: Chelsea Green Publishing. ISBN978-0930031756. OCLC32822552.
Coleman 1995, pp. 278–288 Coleman, Eliot (1995). The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener. A Gardener's Supply Book. Illustrated by Sheri Amsel. Foreword by Paul Hawken. Revised and expanded edition. (2nd ed.). Vermont, USA: Chelsea Green Publishing. ISBN978-0930031756. OCLC32822552.