diff --git a/src/BookSearch/BookSearch.php b/src/BookSearch/BookSearch.php
index e09da91..da562a6 100644
--- a/src/BookSearch/BookSearch.php
+++ b/src/BookSearch/BookSearch.php
@@ -280,7 +280,7 @@ class BookSearch
      * @return array Books information
      * @throws WebException
      */
-    public static function GetBooks(array $codes, $field = 'code') {
+    public static function getBooks(array $codes, $field = 'code') {
         // it is faster to do multiple small request to Solr rather than one big so separate
         // in chunks if we are above the limit. 15 was found by testing and seems to be a sweet spot
         $limit = 15;
@@ -290,7 +290,7 @@ class BookSearch
             $books = array();
             foreach($parts as $p) {
                 // if we use array_merge here the numerical keys (book code) will be lost
-                $books += self::GetBooks($p, $field);
+                $books += self::getBooks($p, $field);
             }
             return $books;
         }
@@ -302,7 +302,7 @@ class BookSearch
         return $results['books'];
     }
 
-    public static function GetTerms($field) {
+    public static function getTerms($field) {
         $s = new BookSearch();
         $s->addFilterQuery(1, 'visible');
         $s->addFacetField($field);
@@ -313,7 +313,7 @@ class BookSearch
     }
 
 
-    public static function GetTermsRange($field) {
+    public static function getTermsRange($field) {
         $s = new BookSearch();
         $s->addFilterQuery(1, 'visible');
         $s->setFacetRangeField($field);