Leland Cogan

Opportunity to learn in the preparation of mathematics teachers: its structure and how it varies across six countries

Sigrid Blömeke, Richard T. Houang, Leland S. Cogan, 2008 .

Future teachers’ competence to plan a lesson: first results of a six-country study on the efficiency of teacher education

Sigrid Blömeke, Leland S. Cogan, Feng-Jui Hsieh, 2008 .