Soil Conservation on the Downs Seminar, Toowoomba, Queensland, & Agricultural Technologists of Australasia. (1977). Soil Conservation on the Downs Seminar, Toowoomba D.D.I.A.E., 12 August 1977. Agricultural Technologists of Australasia.
Cita Chicago (17th ed.)Soil Conservation on the Downs Seminar, Toowoomba, Queensland, i Agricultural Technologists of Australasia. Soil Conservation on the Downs Seminar, Toowoomba D.D.I.A.E., 12 August 1977. Toowoomba, Q.: Agricultural Technologists of Australasia, 1977.
Cita MLA (8th ed.)Soil Conservation on the Downs Seminar, Toowoomba, Queensland, i Agricultural Technologists of Australasia. Soil Conservation on the Downs Seminar, Toowoomba D.D.I.A.E., 12 August 1977. Agricultural Technologists of Australasia, 1977.