APA (7th ed.) Citation

Sarojini Devi Algaretnam. (1989). Van Hiele levels of geometric thought in relation to similarity and congruence in triangles.

Chicago Style (17th ed.) Citation

Sarojini Devi Algaretnam. Van Hiele Levels of Geometric Thought in Relation to Similarity and Congruence in Triangles. 1989.

MLA (8th ed.) Citation

Sarojini Devi Algaretnam. Van Hiele Levels of Geometric Thought in Relation to Similarity and Congruence in Triangles. 1989.

Warning: These citations may not always be 100% accurate.