APA

Tiessen H., López-Hernández I. D. & Salcedo I. H. (1991). Phosphorus cycles in terrestrial and aquatic ecosystems: regional workshop 3: South and Central America : proceedings of a workshop arranged by the Scientific Committee on Problems of the Environment (SCOPE) and the United Nations Environmental Programme (UNEP) organized by the Universidad Central de Venezuela, November 28 to December 6, 1989 in Maracay, Venezuela. Saskatoon: Saskatchewan Institute of Pedology, University of Saskatchewan.

Chicago

Tiessen Holm, López-Hernández Iván Danilo and Salcedo Ignacio H. 1991. Phosphorus cycles in terrestrial and aquatic ecosystems: regional workshop 3: South and Central America : proceedings of a workshop arranged by the Scientific Committee on Problems of the Environment (SCOPE) and the United Nations Environmental Programme (UNEP) organized by the Universidad Central de Venezuela, November 28 to December 6, 1989 in Maracay, Venezuela. Saskatoon: Saskatchewan Institute of Pedology, University of Saskatchewan.

Harvard

Tiessen H., López-Hernández I. D. and Salcedo I. H. (1991). Phosphorus cycles in terrestrial and aquatic ecosystems: regional workshop 3: South and Central America : proceedings of a workshop arranged by the Scientific Committee on Problems of the Environment (SCOPE) and the United Nations Environmental Programme (UNEP) organized by the Universidad Central de Venezuela, November 28 to December 6, 1989 in Maracay, Venezuela. Saskatoon: Saskatchewan Institute of Pedology, University of Saskatchewan.

MLA

Tiessen Holm, López-Hernández Iván Danilo and Salcedo Ignacio H. Phosphorus cycles in terrestrial and aquatic ecosystems: regional workshop 3: South and Central America : proceedings of a workshop arranged by the Scientific Committee on Problems of the Environment (SCOPE) and the United Nations Environmental Programme (UNEP) organized by the Universidad Central de Venezuela, November 28 to December 6, 1989 in Maracay, Venezuela. Saskatoon: Saskatchewan Institute of Pedology, University of Saskatchewan. 1991.