Cita APA

Helick, R. M. (1973). Elements of preschool playyards. Regent Graphic Services.

Citación estilo Chicago

Helick, R. Martin. Elements of Preschool Playyards. Pittsburgh: Regent Graphic Services, 1973.

Cita MLA

Helick, R. Martin. Elements of Preschool Playyards. Regent Graphic Services, 1973.

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