APA

Gregorich B., Boyer R., . (2009). Uppercase Alphabet. USA: School zone.

Chicago

Gregorich Barbara, Boyer Robin, . 2009. Uppercase Alphabet. USA: School zone.

Harvard

Gregorich B., Boyer R., . (2009). Uppercase Alphabet. USA: School zone.

MLA

Gregorich Barbara, Boyer Robin, . Uppercase Alphabet. USA: School zone. 2009.