APA (7th ed.) Citation

Foster, C., Hodgen, J., & Küchemann, D. (2018). Defining a rhombus. Association of Teachers of Mathematics.

Chicago Style (17th ed.) Citation

Foster, Colin, Jeremy Hodgen, and Dietmar Küchemann. Defining a Rhombus. Association of Teachers of Mathematics, 2018.

MLA (9th ed.) Citation

Foster, Colin, et al. Defining a Rhombus. Association of Teachers of Mathematics, 2018.