APA

Roberson K., Holley V., . (2004). My shoelaces are hard to tie!. Nueva York (Estados Unidos): Scholastic.

Chicago

Roberson Karla, Holley Vanessa, . 2004. My shoelaces are hard to tie!. Nueva York (Estados Unidos): Scholastic.

Harvard

Roberson K., Holley V., . (2004). My shoelaces are hard to tie!. Nueva York (Estados Unidos): Scholastic.

MLA

Roberson Karla, Holley Vanessa, . My shoelaces are hard to tie!. Nueva York (Estados Unidos): Scholastic. 2004.