APA
Billstein R., Libeskind S. & Lott J. W. (1990). A problem solving approach to mathematics for elementary school teachers. Redwood City, Calif: The Benjamin/Cummings Pub. Co.
Chicago
Billstein Rick, Libeskind Shlomo and Lott Johnny W. 1990. A problem solving approach to mathematics for elementary school teachers. Redwood City, Calif: The Benjamin/Cummings Pub. Co.
Harvard
Billstein R., Libeskind S. and Lott J. W. (1990). A problem solving approach to mathematics for elementary school teachers. Redwood City, Calif: The Benjamin/Cummings Pub. Co.
MLA
Billstein Rick, Libeskind Shlomo and Lott Johnny W. A problem solving approach to mathematics for elementary school teachers. Redwood City, Calif: The Benjamin/Cummings Pub. Co. 1990.